Database Users

[Q] SetCPU governors (explained)

The SetCPU website explains some governors: http://www.pokedev.com/setcpu/#7
However it seems that some extra governors, not covered by the SetCPU site, have been added to some kernels; which I think should be documented so users know which one to pick.
I will add responses as to what each governor does to this post. If there are any governors not explained that you've come across, please post and we'll see if somebody can explain it.
Unexplained governors (somebody please tell me what they do)
smartass (Best explanation i've found paraphrases to: based on interactive, but better.)
----
ondemand
Available in most kernels, and the default governor in most kernels. When the CPU load reaches a certain point (see "up threshold" in Advanced Settings), ondemand will rapidly scale the CPU up to meet demand, then gradually scale the CPU down when it isn't needed. - SetCPU website
conservative
Available in some kernels. It is similar to the ondemand governor, but will scale the CPU up more gradually to better fit demand. Conservative provides a less responsive experience than ondemand, but can save battery. - SetCPU website
performance
Available in most kernels. It will keep the CPU running at the "max" set value at all times. This is a bit more efficient than simply setting "max" and "min" to the same value and using ondemand because the system will not waste resources scanning for the CPU load. This governor is recommended for stable benchmarking. - SetCPU website
powersave
Available in some kernels. It will keep the CPU running at the "min" set value at all times. - SetCPU website
userspace
A method for controlling the CPU speed that isn't currently used by SetCPU. For best results, do not use the userspace governor. - SetCPU website
Interactive
The 'interactive' governor has a different approach. Instead of sampling the cpu
at a specified rate, the governor will scale the cpu frequency up when coming
out of idle. When the cpu comes out of idle, a timer is configured to fire
within 1-2 ticks. If the cpu is 100% busy from exiting idle to when the timer
fires then we assume the cpu is underpowered and ramp to MAX speed.
If the cpu was not 100% busy, then the governor evaluates the cpu load over the
last 'min_sample_rate' (default 50000 uS) to determine the cpu speed to ramp down
to. - [Patches] For developers, interactive governor patch for leo kernel
Thanks,
RJackson

As explained by MDJ:
SMARTASS GOVERNOR - is based on the concept of the interactive governor.
I have always agreed that in theory the way interactive works - by taking over the idle loop - is very attractive. I have never managed to tweak it so it would behave decently in real life. Smartass is a complete rewrite of the code plus more. I think its a success. Performance is on par with the "old" minmax and I think smartass is a bit more responsive. Battery life is hard to quantify precisely but it does spend much more time at the lower frequencies.
Smartass will also cap the max frequency when sleeping to 245Mhz (or if your min frequency is higher than 245 - why?! - it will cap it to your min frequency). Lets take for example the 998/245 kernel, it will sleep at 245. No need for sleep profiles any more!
Click to expand...
Click to collapse

FerretAD said:
As explained by MDJ:
Click to expand...
Click to collapse
I saw that one but didn't use it because it didn't really explain what it does.
RJackson said:
smartass (Best explanation i've found paraphrases to: based on interactive, but better.)
Click to expand...
Click to collapse

Which Kernel support SmartAss? I use WildMonks with SetCPU 2.1.0 and I don't see the "smartass" governor in my list.

SalsaForte said:
Which Kernel support SmartAss? I use WildMonks with SetCPU 2.1.0 and I don't see the "smartass" governor in my list.
Click to expand...
Click to collapse
i have the "savage" kernal with smartass

LeeDroid's Kernals and ROMs support smartass as well

Leong428 said:
LeeDroid's Kernals and ROMs support smartass as well
Click to expand...
Click to collapse
Add Tiamat to the list.

add chad's incredikernel

SalsaForte said:
Which Kernel support SmartAss? I use WildMonks with SetCPU 2.1.0 and I don't see the "smartass" governor in my list.
Click to expand...
Click to collapse
On my evo shift the x99 kernel supports smartass for stockish froyo roms and cm7 roms
you have to have a kernel to add smartass to your list

RJackson said:
The SetCPU website explains some governors: http://www.pokedev.com/setcpu/#7
However it seems that some extra governors, not covered by the SetCPU site, have been added to some kernels; which I think should be documented so users know which one to pick.
I will add responses as to what each governor does to this post. If there are any governors not explained that you've come across, please post and we'll see if somebody can explain it.
Unexplained governors (somebody please tell me what they do)
smartass (Best explanation i've found paraphrases to: based on interactive, but better.)
----
ondemand
Available in most kernels, and the default governor in most kernels. When the CPU load reaches a certain point (see "up threshold" in Advanced Settings), ondemand will rapidly scale the CPU up to meet demand, then gradually scale the CPU down when it isn't needed. - SetCPU website
conservative
Available in some kernels. It is similar to the ondemand governor, but will scale the CPU up more gradually to better fit demand. Conservative provides a less responsive experience than ondemand, but can save battery. - SetCPU website
performance
Available in most kernels. It will keep the CPU running at the "max" set value at all times. This is a bit more efficient than simply setting "max" and "min" to the same value and using ondemand because the system will not waste resources scanning for the CPU load. This governor is recommended for stable benchmarking. - SetCPU website
powersave
Available in some kernels. It will keep the CPU running at the "min" set value at all times. - SetCPU website
userspace
A method for controlling the CPU speed that isn't currently used by SetCPU. For best results, do not use the userspace governor. - SetCPU website
Interactive
The 'interactive' governor has a different approach. Instead of sampling the cpu
at a specified rate, the governor will scale the cpu frequency up when coming
out of idle. When the cpu comes out of idle, a timer is configured to fire
within 1-2 ticks. If the cpu is 100% busy from exiting idle to when the timer
fires then we assume the cpu is underpowered and ramp to MAX speed.
If the cpu was not 100% busy, then the governor evaluates the cpu load over the
last 'min_sample_rate' (default 50000 uS) to determine the cpu speed to ramp down
to. - [Patches] For developers, interactive governor patch for leo kernel
Thanks,
RJackson
Click to expand...
Click to collapse
Thanks for the kind descriptions...
I've translated them to Korean for my fellow countrymen!
>,<
http://caleb1783.tistory.com/157

Thanks for this. Smartass has been a mystery to me.

When I installed SETCPU I selected auto-detect, now on my device (not a HD2, but this seemed like a good place to ask as it is directly related) now I have no way to select the governor at all (box is blank), how to I change the detection from automatic to a device type "Tegra 2" in my case, I see no option to allow me to do this?
Thanks,
ERIC

Powersave
I read on this forum that Power save SetCPU governor saves the best battery. I Hope this is true?
I am trying to get my hands on powersave
I can't find powersave in the "market" though.. What's up with that? Can anyone tell me which one it is? Maybe give the name of the developer so i can find it back easier?
thnks in advance
Im using galaxy s 2 with lite'ning rom 6.1 ninphetamine 2.0.5

ssienn said:
I read on this forum that Power save SetCPU governor saves the best battery. I Hope this is true?
I am trying to get my hands on powersave
I can't find powersave in the "market" though.. What's up with that? Can anyone tell me which one it is? Maybe give the name of the developer so i can find it back easier?
thnks in advance
Im using galaxy s 2 with lite'ning rom 6.1 ninphetamine 2.0.5
Click to expand...
Click to collapse
Yeah, that's not how it works. Governors are a part of the kernel. If you want features in your kernel that you don't have, you must flash a new kernel.
also, perhaps you should reread what 'powersave' is. It will keep your phone at the lowest cpu speed constantly. This will save battery, sure, but it will also completely destroy your phone's performance. Might as well go back to your old Moto Razr.

thx, actually, i set those gov randomly before i read this post

Ondemand vs. Smartass vs. Performance gov. - Test
The idea was, that maybe the display eats so much power,
that if it is on, the CPU setting does not make a big different.
Bottom line: it does.
Phone: HTC Sensation, Leedroid Sensational 3.1 (kernel 3.2)
Conditions: Simulating light cpu use like writing email:
Brightness 50% (no timeout), MP3 playing (Volume=1, headphone), a new document on the screen,
Wifi and 3G network off (these have fluctuation, so it is easier to compare if these are off)
Ondemand 192/1188 governor: 5 h 10 min
Performance governor: 4 h 20 min
SmartassV2 192/1188 governor: 5 h 2 min
Off course if the display is off, it is easy to choose, because there is no need for performance.
I set up Conservative 192/810, but any similar can work.
I choose Ondemand, and using "Tasker" to switch to Performance, if certain applications are active,
like Doodle Jump - which run a little smoother with the Performance, for as an example.

thanks for the info...

nice, thanks

Thanks, cleared my doubts.

completely noob question, how do u choose between governors? set cpu from the market its a paid app, and the one i downloades from the official post wont work
i have a galaxy s2 with Touch X-POWER+ 2.1 [XXKI3] rom

[GUIDE] Governors for NOOBS

Interactive - Instead of sampling the cpu at a specified rate, the governor will scale the cpu frequency up when coming out of idle. When the cpu comes out of idle, a timer is configured to fire within 1-2 ticks. If the cpu is 100% busy from exiting idle to when the timer fires then we assume the cpu is underpowered and ramp to MAX speed.
Smartass- Is an improved version of interactive governor
Ondemand – Available in most kernels, and the default governor in most kernels. When the CPU load reaches a certain point (see “up threshold” in Advanced Settings), ondemand will rapidly scale the CPU up to meet demand, then gradually scale the CPU down when it isn't needed.
Conservative– Available in some kernels. It is similar to the ondemand governor, but will scale the CPU up more gradually to better fit demand. Conservative provides a less responsive experience than ondemand, but can save battery.
Performance – Available in most kernels. It will keep the CPU running at the “max” set value at all times. This is a bit more efficient than simply setting “max” and “min” to the same value and using ondemand because the system will not waste resources scanning for CPU load.
Powersave – Available in some kernels. It will keep the CPU running at the “min” set value at all times.
Userspace– A method for controlling the CPU speed that isn't currently used by SetCPU. For best results, do not use the userspace governor.
Hope those will able to help newbies to SetCPU or No Frills CPU.
Credit to LeeDroid for the infos

I believe Interactive is the most responsive kernel out there. Faster than ondemand. So it'll technically use more power when you are using the phone.
HOWEVER, isn't the best feature of Smartass the ability to cap frequencies when the screen is OFF? This essentially negates the need for using SetCPU to limit frequenceis when screen is off. Yes it's an improved version of interactive, but it should be just as responsive, but with these set limits in. I'm just not sure what the specific rules are. I used it for my Moto Milestone, but I'm unsure of what the rules are here.

window7 said:
Interactive - Instead of sampling the cpu at a specified rate, the governor will scale the cpu frequency up when coming out of idle. When the cpu comes out of idle, a timer is configured to fire within 1-2 ticks. If the cpu is 100% busy from exiting idle to when the timer fires then we assume the cpu is underpowered and ramp to MAX speed.
Smartass - Is an improved version of interactive governor
Ondemand – Available in most kernels, and the default governor in most kernels. When the CPU load reaches a certain point (see “up threshold” in Advanced Settings), ondemand will rapidly scale the CPU up to meet demand, then gradually scale the CPU down when it isn't needed.
Conservative – Available in some kernels. It is similar to the ondemand governor, but will scale the CPU up more gradually to better fit demand. Conservative provides a less responsive experience than ondemand, but can save battery.
Performance – Available in most kernels. It will keep the CPU running at the “max” set value at all times. This is a bit more efficient than simply setting “max” and “min” to the same value and using ondemand because the system will not waste resources scanning for CPU load.
Powersave – Available in some kernels. It will keep the CPU running at the “min” set value at all times.
Userspace – A method for controlling the CPU speed that isn't currently used by SetCPU. For best results, do not use the userspace governor.
Hope those will able to help newbies to SetCPU or No Frills CPU.
And do correct me if I am wrong. Thank you
Click to expand...
Click to collapse
You should credit the source you copy and pasted that from. Or even better post the link.
Sent from my Nexus S using XDA App

dmo580 said:
I believe Interactive is the most responsive kernel out there. Faster than ondemand. So it'll technically use more power when you are using the phone.
HOWEVER, isn't the best feature of Smartass the ability to cap frequencies when the screen is OFF? This essentially negates the need for using SetCPU to limit frequenceis when screen is off. Yes it's an improved version of interactive, but it should be just as responsive, but with these set limits in. I'm just not sure what the specific rules are. I used it for my Moto Milestone, but I'm unsure of what the rules are here.
Click to expand...
Click to collapse
SMARTASS is a rewrite of the INTERACTIVE governor, and it moves the CPU up/down depending on whether the phone is idle/locked/ ... etc.
But some problems that I experience with SMARTASS is that my music playback sometimes stutters(?). So I'm just sticking with INTERACTIVE.

http://setcpu.com
edit:/#7 didnt seem to work right?

matt2053 said:
You should credit the source you copy and pasted that from. Or even better post the link.
Sent from my Nexus S using XDA App
Click to expand...
Click to collapse
Thanks for telling me that. I had changed it
However, I cant post the link as I cannot find the source I find it.
I only know that LeeDroid provided me the details

window7 said:
Thanks for telling me that. I had changed it
However, I cant post the link as I cannot find the source I find it.
I only know that LeeDroid provided me the details
Click to expand...
Click to collapse
I believe it comes from SetCPU's website.
Http://www.setcpu.com
Sent from my Nexus S using XDA App

olorin86 said:
SMARTASS is a rewrite of the INTERACTIVE governor, and it moves the CPU up/down depending on whether the phone is idle/locked/ ... etc.
But some problems that I experience with SMARTASS is that my music playback sometimes stutters(?). So I'm just sticking with INTERACTIVE.
Click to expand...
Click to collapse
Is this because your screen is off? Yeah, smartass has some issues when the screen is off. Main issue is wakeup and whatever else your phone has to do. I know the Netarchy kernel with smartass just got a revision lately to deal with more wake issues.
But in terms of when your screen is on smartass should function exactly like interactive. So that's why I said smartass is essentially interactive, but with those preset rules regarding screen off that you would otherwise have to create using SetCPU.
The reason you might have worse battery might be because during screen off, your phone is struggling to do work at a slower pace (ideally you shouldn't have to do much, but maybe some people's phones have a lot of stuff running in the background), and so the more time you spent with the CPU active ends up eating more power.
This is one of the arguments about Intel Atom vs. Intel i3. Both idle at the same wattage, but the i3 uses massively more power in load. Probably 2x-3x more. However, given that the i3 is like so FAST, it gets say an encoding job done in like 1/4 the time. Your overall power (Watts * time) used is actually less with the faster CPU. This might apply with the Smartass governor. If your CPU is struggling and maxing out at its cap for a long time because its not fast enough when the screen is off, then perhaps this can be an issue. Just a thought. This is why I think the max_freq for sleep should probably be set around 500-600mhz instead of like 200mhz.
But once again I'm not sure what the governor is set at right now. If someone knows, please do tel

Governor descriptions for those using custom kernels and cpu manager

I wanted to know what the different governors do, rather than filling dev's threads up with questions I thought i would have a look around and do this for others who like me wanted to know what they do:
1: Interactive
The CPUfreq governor "interactive" is designed for low latency, interactive workloads. This governor sets the CPU speed depending on usage, similar to "ondemand" and "conservative" governors. However there is no polling, or 'sample_rate' required to scale the CPU up. Sampling CPU load every X ms can lead to under powering the CPU for X ms, leading to dropped framerate, stuttering UI etc..Scaling the CPU up is done when coming out of idle, and like "ondemand" scaling up will always go to MAX, then step down based off of cpu load.
There is only one tuneable value for this governor: min_sample_time: The ammount of time the CPU must spend (in uS) at the current frequency before scaling DOWN. This is done to
more accurately determine the cpu workload and the best speed for that workload. The default is 50ms.
2:Min Max
well this governor makes use of only min & maximum frequency based on workload... no intermediate frequencies are used.
3:Smartass
(Quoted from another author http://www.ziggy471.com/2010/11/07/s...-governor-info ) - "is based on the concept of the interactive governor.
I have always agreed that in theory the way interactive works – by taking over the idle loop – is very attractive. I have never managed to tweak it so it would behave decently in real life. Smartass is a complete rewrite of the code plus more. I think its a success. Performance is on par with the “old” minmax and I think smartass is a bit more responsive. Battery life is hard to quantify precisely but it does spend much more time at the lower frequencies.
Smartass will also cap the max frequency when sleeping to 352Mhz (or if your min frequency is higher than 352 – why?! – it will cap it to your min frequency). Lets take for example the 528/176 kernel, it will sleep at 352/176. No need for sleep profiles any more!"
4:Scary
A new governor wrote based on conservative with some smartass features, it scales accordingly to conservatives laws. So it will start from the bottom, take a load sample, if it's above the upthreshold, ramp up only one speed at a time, and ramp down one at a time. It will automatically cap the off screen speeds to 245Mhz, and if your min freq is higher than 245mhz, it will reset the min to 120mhz while screen is off and restore it upon screen awakening, and still scale accordingly to conservatives laws. So it spends most of its time at lower frequencies. The goal of this is to get the best battery life with decent performance. It will give the same performance as conservative right now, it will get tweaked over time.
I assume performance, conservative, powersave and ondemand are self explanatory,
Userspace - finding conflicting info, so if a dev wants to help me out ??
All this info was found on the web in various places, where possible I have quoted where from. If people would like me to link back to them please let me know I will add.
This is purely to help people understand the governors a little without filling dev threads
Can people also leave user feedback on the governors they have been using to give us a reference point to help us all
if it helped hit thanks
Dooms Kernel : http://forum.xda-developers.com/showthread.php?t=1226826
Schedulers post 3

Nice one Chiefy, good to know we have a thread for quick reference when needing it.

Schedulers
NOOP scheduler
The NOOP scheduler inserts all incoming I/O requests into a simple, unordered
FIFO queue and implements request merging.
The scheduler assumes I/O performance optimization will be handled at some
other layer of the I/O hierarchy; e.g., at the block device; by an intelligent
HBA such as a Serial Attached SCSI (SAS) RAID controller or by an externally
attached controller such as a storage subsystem accessed through a
switched Storage Area Network).
NOOP scheduler is best used with solid state devices such as flash memory
or in general with devices that do not depend on mechanical movement to
access data (meaning typical "hard disk" drive technology consisting of seek
time primarily, plus rotational latency). Such non-mechanical devices do not
require re-ordering of multiple I/O requests, a technique that groups together
I/O requests that are physically close together on the disk, thereby reducing
average seek time and the variability of I/O service time.
Deadline
The goal of the Deadline scheduler is to attempt to guarantee a start service time for a request[1]. It does that by imposing a deadline on all I/O operations to prevent starvation of requests. It also maintains two deadline queues, in addition to the sorted queues (both read and write). Deadline queues are basically sorted by their deadline (the expiration time), while the sorted queues are sorted by the sector number.
Before serving the next request, the Deadline scheduler decides which queue to use. Read queues are given a higher priority, because processes usually block on read operations. Next, the Deadline scheduler checks if the first request in the deadline queue has expired. Otherwise, the scheduler serves a batch of requests from the sorted queue. In both cases, the scheduler also serves a batch of requests following the chosen request in the sorted queue.
By default, read requests have an expiration time of 500 ms, write requests expire in 5 seconds.
Anticipatory
Anticipatory scheduling is an algorithm for scheduling hard disk input/output. It seeks to increase the efficiency of disk utilization by "anticipating" synchronous read operations.
"Deceptive idleness" is a situation where a process appears to be finished reading from the disk when it is actually processing data in preparation of the next read operation. This will cause a normal work-conserving I/O scheduler to switch to servicing I/O from an unrelated process. This situation is detrimental to the throughput of synchronous reads, as it degenerates into a seeking workload.[1] Anticipatory scheduling overcomes deceptive idleness by pausing for a short time (a few milliseconds) after a read operation in anticipation of another close-by read requests.[2]
Anticipatory scheduling yields significant improvements in disk utilization for some workloads.[3] In some situations the Apache web server may achieve up to 71% more throughput from using anticipatory scheduling.[4]
The Linux anticipatory scheduler may reduce performance on disks using TCQ, high performance disks, and hardware RAID arrays.[5] An anticipatory scheduler (AS) was the default Linux kernel scheduler between 2.6.0 and 2.6.18, by which time it was replaced by the CFQ scheduler.
BFQ
The Brain **** Scheduler (or BFS) is a task scheduler designed for the Linux kernel in August of 2009 as an alternative to the Completely Fair Scheduler and the O(1) scheduler.[2] BFS was created by veteran kernel programmer Con Kolivas[3].
The objective of BFS, compared to other schedulers, was to provide a scheduler with a simpler algorithm, that did not require adjustment of heuristics or tuning parameters to tailor performance to a specific type of computation workload. The BFS author asserted that these tunable parameters were difficult for the average user to understand, especially in terms of interactions of multiple parameters with each other, and claimed that the use of such tuning parameters could often result in improved performance in a specific targeted type of computation, at the cost of worse performance in the general case.[4] BFS has been reported to improve responsiveness on light-NUMA (non-uniform memory access) Linux mobile devices and desktop computers with fewer than 16 cores.
CFQ
CFQ, also known as "Completely Fair Queuing", is an I/O scheduler for the Linux kernel which was written in 2003 by Jens Axboe.
CFQ works by placing synchronous requests submitted by processes into a number of per-process queues and then allocating timeslices for each of the queues to access the disk. The length of the time slice and the number of requests a queue is allowed to submit depends on the IO priority of the given process. Asynchronous requests for all processes are batched together in fewer queues, one per priority. While CFQ does not do explicit anticipatory IO scheduling, it achieves the same effect of having good aggregate throughput for the system as a whole, by allowing a process queue to idle at the end of synchronous IO thereby "anticipating" further close IO from that process. It can be considered a natural extension of granting IO time slices to a process.

I am testing scary at the mo on stock gb so will edit my post tomorrow bro.

over the next week I will use scary, smartass, ondemand, conservative and interactive and report my findings back here
please all get involved and report back your findings
Can people also post their voltage findings with Dooms new kernel
Scary Report
Phone been on 9h 39m, medium usage, clocking set 128-1113, voltages changed as above post,phone very responsive and no lags, battery remaining 39%, AnTuTu benchmark 2755 linpack 39.

Interactive Report
128-1132 up time 6h 25mins, phone responsive no lag, medium usage 36% left, AnTuTu benchmark 2502 linpack 36 this governor doesnt seem to help battery level very much

6h 25mins and only 36% left? OMG! that's a battery drain!
Well, Quite frankly I went through the governors, Which do you think is better? Can you describe each governor in one word?
I'm on wolf rom with fps uncapped (3.x if i remember well) i haven't upgraded due to the issues pertaining to the users.
Can you just suggest me a good governor based on your experience? Can I get 24 hours of uptime with custom kernels or i still have to wait? ( I know I love OC that we had on 2.2 but looking at the battery drain I'm cautious whether or not to flash the custom kernels )
Thanks for your guide. It's epic!

Neo said:
6h 25mins and only 36% left? OMG! that's a battery drain!
Well, Quite frankly I went through the governors, Which do you think is better? Can you describe each governor in one word?
I'm on wolf rom with fps uncapped (3.x if i remember well) i haven't upgraded due to the issues pertaining to the users.
Can you just suggest me a good governor based on your experience? Can I get 24 hours of uptime with custom kernels or i still have to wait? ( I know I love OC that we had on 2.2 but looking at the battery drain I'm cautious whether or not to flash the custom kernels )
Thanks for your guide. It's epic!
Click to expand...
Click to collapse
so far the best governors that i have used have been Smartass and Scary but i will continue testing the governors and reporting back. Smartass was working great with no o/c for me, i will add this to this test. tomorrow i will test Scary with no o/c

Ok, my conclusions of using the scary gov on my modded stock gb is probally the best my phone has been, nearly all frequencies are being used, had to use min 192 and max 1190 as had a few screen off reboots but once using those settings my no more reboots. Battery life is the best i have had on custom kernel with flat line overnight, 3% loss, with wifi off and hourly updates of email, deep sleep working perfect as it should.
Overall, this is my personal favorite so far, just to add also this is using...
http://doomlord.sylvester20007.com/x10/x10_gb/dk/v02/dk-v02-X-modfxp_xrec.zip
I have not started using v03 of Dooms new kernel because of the good results with v02x.

Samrtass Report
Running Smartass governor uptime 5hours 1minute 128-1132cpu, medium usage, twitter, facebook two calls, brightness and 50%, AnTuTu Benchmark 1569 linpack 31 ( second linpac got WLOD ) battery 69%
Edit 10hours up time 42% battery left
As you can see smartass is a battery friend but performance suffers, although for my usage i find that this is the best governor for me at the minute
further governor tests continue

MIN/MAX Report
I tried to use this governor but it kept causing random reboots so gave up

keep going!!

I know this is missing topic but how would I overclock my x10. If it is, how safe is it?
Sent from my x10 Platinum

om23 said:
I know this is missing topic but how would I overclock my x10. If it is, how safe is it?
Sent from my x10 Platinum
Click to expand...
Click to collapse
From what I have encountered it depends on the age of your phone, it is safe and won't blow you phone up but some models can handle far greater stress. the newer phones tend to be able to overclock higher, all that will happen if you phone cant handle the overclock is you will get the dreaded WLOD and your phone will reboot, then if you have set the speed from boot you may get stuck at boot image, but if that is the case then you use flash tool and reflash

chiefy009 said:
MIN/MAX Report
I tried to use this governor but it kept causing random reboots so gave up
Click to expand...
Click to collapse
Thanks for this thread chiefy009!
I have tried all governors too (on Doom's kernel) and I have different experience to yours, so I thought I'd share.
For me, interactive/ondemand/smartass make the phone VERY choppy, especially while scrolling lists!
On the other hand, minmax gives me the smoothest and fastest results.
And I thought that jumping from Deep Sleep/MIN frequency to MAX frequency, without intermediate steps, would kill my battery but, to my amazement, battery life is very very good, I might say better than any other governor.
When I was using minmax as a module to the stock kernel, I got reboots too,
but since Doom integrated it into his kernel, it's stable as rock!
This is the info I found about this governor:
MinMax Governor (Battery Saver)
This governor will try to minimize the frequency jumps/changes which cause voltage spikes/changes and supposedly drain more battery life
Click to expand...
Click to collapse
Just my 2 cents!

My_Immortal said:
Thanks for this thread chiefy009!
I have tried all governors too (on Doom's kernel) and I have different experience to yours, so I thought I'd share.
For me, interactive/ondemand/smartass make the phone VERY choppy, especially while scrolling lists!
On the other hand, minmax gives me the smoothest and fastest results.
And I thought that jumping from Deep Sleep/MIN frequency to MAX frequency, without intermediate steps, would kill my battery but, to my amazement, battery life is very very good, I might say better than any other governor.
When I was using minmax as a module to the stock kernel, I got reboots too,
but since Doom integrated it into his kernel, it's stable as rock!
This is the info I found about this governor:
Just my 2 cents!
Click to expand...
Click to collapse
Thank you for getting involved, if you have time could you post all your findings on your usage of the governors ?

chiefy009 said:
Thank you for getting involved, if you have time could you post all your findings on your usage of the governors ?
Click to expand...
Click to collapse
Sure thing!
I am on Doom's kernel, which I believe includes all the available governors so far.
Scary Governor
Description coming from the author:
A new governor I wrote based on conservative with some smartass features, it scales accordingly to conservatives laws. So it will start from the bottom, take a load sample, if it's above the upthreshold, ramp up only one speed at a time, and ramp down one at a time. It will automatically cap the off screen speeds to 245Mhz, and if your min freq is higher than 245mhz, it will reset the min to 120mhz while screen is off and restore it upon screen awakening, and still scale accordingly to conservatives laws. So it spends most of its time at lower frequencies. The goal of this is to get the best battery life with decent performance. It will give the same performance as conservative right now, it will get tweaked over time.
Click to expand...
Click to collapse
Performance suffers, in my opinion.
It scales the CPU conservatively, so it is very annoying when playing games
or even syncing to get your Gmails.
Also, and this applies to all governors, speed is decreased when the sampling rate is high. Which means that if the CPU constantly checks for load in order to increase/decrease frequency, that will take its toll both to performance and battery life.
Smartass - Interactive - Ondemand
I am putting those 3 governors in the same category, because at least for me, they functioned very similarly.
What I noticed is that indeed the phone used almost all available frequencies before going to MAX, but the phone was laggy. Especially when scrolling in big lists, interactive and smartass gave me unacceptable performance. Ondemand was a tad better, but still, the phone seemed to "resist" scrolling for a few seconds and then go ahead and finally do it!
Battery life was pretty much the same as stock
(since ondemand is the default governor for stock kernel).
MinMax
As I stated in my previous post, minmax gave me the smoothest and fastest results.
This governor doesn't take intermittent load samples, when it first detects CPU load, aka you start using your phone, it jumps to the max frequency and stays there until you stop using it.
At this point, I want to express my opinion on the subject of "High Freq When Screen On", because many users complain about it, but I beg to differ.
In theory, CPU running at max frequency all the time, is heat generating and/thus battery consuming. Alas, be careful: in theory...
Because practically, when you use your phone, you usually do CPU demanding tasks.
When the phone is in my pocket/bag/drawer/whenever doing nothing, I want to be in Deep Sleep.
When I turn it on to look at the time of if there's any new notification, that lasts 30 secs - 1 minute. What frequency will be used then, is not that important.
When I turn it on to actually do something, I want it to be FAST.
If I can scroll a list faster, if I can open an app faster, then I will be using the phone for less time.
If the CPU is sampling and scaling up conservatively, the phone will be laggy
and I will need more time to accomplish my tasks.
All in all, I am not intimitaded by high frequencies while using the phone.
I would start worrying if I got no Deep Sleep -which isn't the case fortunately.
And my battery life is amazing, I get about 1 day and a few hours more,
with pretty heavy use.
Just my 2 cents on the matter.
Powersave
If you are ever really mad at your X10 and you want to see it struggle and suffer, then this is the governor for you! Enough said!
Performance
Pretty snappy, good for gaming and benchmarking, as it uses only MAX frequency. Not for prolonged use though, because it will ONLY use the max frequency (and Deep Sleep of course).
I'll make sure to make more tests in the future and post more thorough reviews!
Again, thanks for this thread chiefy009!!

My_Immortal said:
Sure thing!
I am on Doom's kernel, which I believe includes all the available governors so far.
Click to expand...
Click to collapse
Are you playing with the voltages at all ? if so could you record your findings for everyone ?
I am currently working through the governor list and then plan on trying to level out some voltages which work well

chiefy009 said:
Are you playing with the voltages at all ? if so could you record your findings for everyone ?
I am currently working through the governor list and then plan on trying to level out some voltages which work well
Click to expand...
Click to collapse
I have undervolted my phone using these values:
128000 Hz - 875 V
192000 Hz - 900 V
245760 Hz - 925 V
384000 Hz - 950 V
460800 Hz - 975 V
576000 Hz - 1000 V
652800 Hz - 1050 V
768000 Hz - 1100 V
844800 Hz - 1150 V
921600 Hz - 1200 V
998400 Hz - 1250 V
The phone runs pretty stable, didn't have a single reboot or WLOD so far (3 days).
Xperia X10i via Tapatalk

I will try those settings for undervolting
Smartass Update
This governor is working wonders for me at the minute, phone been online for 6hours, medium/light usage 128-1132mhz few calls, connected to bluetooth speaker in car, little web usage and twitter and the battery is still on 88%
That is impressive

[REF] CPU Governors and I/O Schedulers

Spreadsheets for CPU Governors and I/O Schedulers
GOVERNOR RESULTS
I/O SCHEDULERS
Summary of the Results
This is a summary of the six most commonly used governors, listed in order of performance.
Best Performing
#1 - Performance
--- : Use Noop or Deadline
--- : Uses a lot more battery
#2 - SmartassV2
--- : Use Noop or SIO
--- : Good choice if you use a lot of CPU intensive apps
#3 - LulzactiveV2
--- : Use Deadline or Noop
--- : Good choice if you use a lot of CPU intensive apps
--- : Uses a little more battery than SmartassV2
#4 - Lazy
--- : Use Deadline or CFQ
--- : Do not enable SOMF (Screen Off Max Frequency uses more battery)
--- : Good choice if you do not use CPU intensive apps
#5 - Ondemand
--- : Use Noop or Deadline
--- : Good choice if you do not use CPU intensive apps
--- : Saves slightly more battery than Lazy
#6 - Conservative
--- : Use CFQ or Noop
--- : Generally one of the worst governors for saving battery, see next post for why.
Check my summary in the Battery Drain thread for more info about how to save battery.
Where did the other benchmarks go?
All ICS ROM Benchmarks: this thread
Kernel Features and Benchmarks: this thread
Battery drain: this thread
Power Saving Governors: this thread
Thanks to all the developers.

Conservative Not Saving Power?
chickelnoodensoup said:
Is the summary in the first post correct with regard to conservative? Is it really "Generally one of the worst governors for saving battery"? Interesting.
Click to expand...
Click to collapse
I know it seems a little odd. It's because a lot of developers seem to have tweaked conservative to make it feel snappier, but it has resulted in more CPU time at the top frequency.
If you take a look at my new spreadsheet: http://goo.gl/ThVzX
...you can see conservative always uses more power when the screen is on (at least for the four kernels I tested).
There is just one exception where conservative saves more power than other governors, and that is when the screen is off, music is on, deep idle is on, and this only applies specifically to Air Kernel. PLEASE NOTE: Steve Garon does not include deep idle, but is working on it, neither does Eugene, but I've asked him to consider it. For these two kernels, if you are listening to music with the screen off, currently, the best power saving governor is Ondemand.
For people who don't use their phone while off, and don't use many intensive apps, Ondemand is the best power saving choice.
For people who use a lot of CPU intensive apps, SmartassV2 will be the better choice. It will scale more agressively, help prevent lags, and save energy being wasted through these delays.
If you listen to music with the screen off, and your kernel supplies deep idle, the best power saving governor is SmartassV2 (except for the case of Air Kernel, see above). This is because it keeps the CPU close to the most efficient frequency: 400MHz.
I hope that covers anything. If I've made any glaring errors in my reasoning, please let me know.
Choosing a Governor
Variety is the spice of life, so try them all! While Mathkid95 swears by Ondemand, developers Eugene373, morfic, and steve.garon all vetted this work and agreed that the highest performing CPU governor is likely to offer battery savings through the race-to-idle principal. Eugene added that finding the right I/O scheduler to combine with your governor will make a big difference too. Extra thanks to Steve for providing the kernel on which I based this test, and all his valuable input! The I/O scheduler for the test was cfq, and note: governors have settable parameters which may vary between developers.
Choosing a Scheduler
I/O schedulers perform differently depending on the governor you are using. I've investigated this using the six most popular CPU governors (vote here) vs the six available I/O schedulers in Eugene's kernel, and the four available in r_data's kernel. All governors are based on either ondemand, interactive, or conservative. Recommended reading is available here: schedulers also for governors
Schedulers tested against these popular governors:
SmartassV2 - interactive variant, and winner of the governor test.
LulzactiveV2 - interactive variant
Lazy - Ezekeel's governor, ondemand variant
Performance - included as a reference for high scores
Ondemand
Conservative

Testing Methodology
To test the kernels I want a fair environment, so any differences in the results are down to the kernel, and nothing else. To achieve this I first make sure I have a clean system:
1) Format /system and /cache and wipe dalvic
2) Install the ROM, install the kernel
3) Boot up, use nstools to select deadline for I/O scheduler
4) Then select a CPU governor and I/O scheduler depending on the test at hand
5) Titanium Backup to restore all my benchmark programs (app only). Set everything to off, no gps, no sync, no BT, airplane mode. Force GPU rendering is selected. Wifi is on for connecting to the benchmark servers. A power adaptor is in use so the battery is always full.
Then I begin testing.
For the CPU Governor Comparison study:
6) Power off and power back up. When lock screen arrives, wait one minute to settle the system, i.e. until screen auto-off. Count to three. Unlock, and begin testing, recording all scores. Start over with all the tests. Record those scores. (I now have two sets of scores for all the benchmarks to create a mean for improved accuracy). Then select next governor, power off and on, and start the cycle again.
For the I/O Scheduler Comparison study:
6) Power off and power back up. For each new scheduler I completed one test which I did not record, just to ensure that the program was properly cached in the system. I then recorded the subsequent ten results. After ten results, I would select the next scheduler, until I had finished all six, then I would also select the next governor and go back to the first scheduler. I repeated this cycle until I had collected data for performance, and the three other main governor types.
Statistics in the scheduler study are a little different to the other tests. They combine overall performance scores with overall variance scores (where lower is better). The formula is
a= Database IO score - 3 standard deviations
b= Write speed - 3 standard deviations
c= Read speed - 3 standard deviations
score=(a*b*c) to the power of 1/3
If you multiply three values together, and take the cube root (same as raising to 1/3) then you arrive at the geometric mean. This type of mean allows the comparison of two different schedulers based not just on their performance, but also how consistent in that performance they are. That score is then compensated by adjusting by half of the percentage discrepancy between the mean and median. For most scores that is an adjustment of less than 1%.

Summary of the Results
SmartassV2 won the governor benchmarks, and also performed well in the battery drain benchmarks.
The best I/O scheduler to combine with this is noop.
This is the combination I personally prefer. However, this is merely my opinion, based on my tests. Mathkid95 prefers ondemand. At the time of writing, Steve Garon and Franco prefer their own tweaked versions of conservative. (My tests indicate CFQ is the best match for conservative.)

Nice work on this!

bedalus said:
Summary of the Results
SmartassV2 won the governor benchmarks, and also performed well in the battery drain benchmarks.
The best I/O scheduler to combine with this is noop.
This is the combination I personally prefer. However, this is merely my opinion, based on my tests. Mathkid95 prefers ondemand. At the time of writing, Steve Garon and Franco prefer their own tweaked versions of conservative. (My tests indicate CFQ is the best match for conservative.)
Click to expand...
Click to collapse
Im also prefer smartassv2+noop. Really good combination

Very usefull, Thanks

Surnom said:
Very usefull, Thanks
Click to expand...
Click to collapse
No problem. If anyone is wondering why so few posts, it's because I recently separated this work away from my kernel benchmarking thread. Feel free to feedback.

bedalus said:
Summary of the Results
SmartassV2 won the governor benchmarks, and also performed well in the battery drain benchmarks.
The best I/O scheduler to combine with this is noop.
This is the combination I personally prefer. However, this is merely my opinion, based on my tests. Mathkid95 prefers ondemand. At the time of writing, Steve Garon and Franco prefer their own tweaked versions of conservative. (My tests indicate CFQ is the best match for conservative.)
Click to expand...
Click to collapse
Never kneww that SmartassV2 works best with noop! I used to have it with deadline. Now experiencing the best experience ever!
using Franco BFS Nov 1st
Thanks man! Thanks Franco!

SmartassV2/Noop +1

UPDATE: Steve had a rethink of his Conservative governor parameters, and I've updated the table to include this. Check column L.
Lower scores are natural with conservative. This time, with the new parameters, the scores are even lower. This indicates that the new conservative is throttling the frequencies more aggressively, but it should also be noted that this governor feels much more responsive than the previous incarnation.
Note - the IO score shows a great improvement, but this is due only to a boost in database IO through the recent FSYNC patch. Make sure you use stable voltages to avoid reboots and potential data loss. (No benefit to UV anyway - check the results of my battery study, see link above.)

thx mate! You do a great job!
Sent from my Nexus S using Tapatalk

Some serious work been put into this.. Anyway of listing governors in respect of there performance then a list of governors for best battery life and the recommended I/O schedulers to accompany them. I know the graph is there but it'll be easier for people like me (not so good with cpu settings) to just simply apply from a high to low list which indicates best performance or more battery life. I'm getting great battery life and decent performance using ondemand with noop but it eats battery a lot more when phone is in use compared to other combinations I've tried.
Sent from my HTC Desire S using XDA App

bedalus said:
Summary of the Results
SmartassV2 won the governor benchmarks, and also performed well in the battery drain benchmarks.
The best I/O scheduler to combine with this is noop.
Click to expand...
Click to collapse
Is it just me or does the spreadsheet say deadline is best with SmartassV2 with noop second?

dabado said:
Some serious work been put into this.. Anyway of listing governors in respect of there performance then a list of governors for best battery life and the recommended I/O schedulers to accompany them. I know the graph is there but it'll be easier for people like me (not so good with cpu settings) to just simply apply from a high to low list which indicates best performance or more battery life. I'm getting great battery life and decent performance using ondemand with noop but it eats battery a lot more when phone is in use compared to other combinations I've tried.
Sent from my HTC Desire S using XDA App
Click to expand...
Click to collapse
Good idea. I will try to do it today.
kernels ; battery ; ROM ; gov/sched

Thaks to your recommend, I use noop + SmartassV2.
I used cfq+tweaked conservative before that set, but I can't feel differece and battery life (I don't know this phrase mean but I'm saying it is very good!)

UPDATE: First post edited. Now summarises all findings. Also, makes it easier to read if you are using the XDA app

Thank you !

Bedalus, I did a little amateur test today.
I played some music with not-too-loud volume.
I keep my data ON, everything else is off.
The screen is always ON with lowest brightness because I'm looking at the CPU frequency used.
CPU min 200, max 1000.
I went to Processor settings and look at the CPU frequency used at the moment.
When I selected Conservative and let it stay for 10 seconds, the CPU freq is showing 1000 constant.
Then I selected Lazy and let it stay for another 10 seconds, the CPU freq is 400 constant.
With SmartassV2, let it stay for 10 seconds, the CPU freq is randomly jumping from 200, 400 and sometimes 1000.
Well my question is, shouldn't Conservative be constantly using the lowest frequency among the other governors?
From what I saw it is Lazy which constantly used the lowest.
What do you think?
I know this test is not reliable at all, so sorry if it's just a waste of time.

glennkaonang said:
Bedalus, I did a little amateur test today.
I played some music with not-too-loud volume.
I keep my data ON, everything else is off.
The screen is always ON with lowest brightness because I'm looking at the CPU frequency used.
CPU min 200, max 1000.
I went to Processor settings and look at the CPU frequency used at the moment.
When I selected Conservative and let it stay for 10 seconds, the CPU freq is showing 1000 constant.
Then I selected Lazy and let it stay for another 10 seconds, the CPU freq is 400 constant.
With SmartassV2, let it stay for 10 seconds, the CPU freq is randomly jumping from 200, 400 and sometimes 1000.
Well my question is, shouldn't Conservative be constantly using the lowest frequency among the other governors?
From what I saw it is Lazy which constantly used the lowest.
What do you think?
I know this test is not reliable at all, so sorry if it's just a waste of time.
Click to expand...
Click to collapse
It sounds like quite an interesting test. I'm surprised at the conservative result. Which kernel are you on?

[TWEAK][N.E.A.K][14.3.2012]Rock Solid Config v1.1 for Lulz/VC app + Guide

Right i am not going to bore you with long ass intros or long essays on how to do this and how to do that. All i did was share my results on a thread and people started messaging me about my settings and what configurations i use. So i will make it all simple for you. I am opening a thread so you can see what settings i am using and use it as a guide and adjust them or use my own settings if you want to get the best out of your battery and enjoy more your baby. Plus this thread is for you guys to stop private messaging me as i am getting loads of messages and hardly have time to reply to you all.​
First off and call it a disclaimer if you want, what WORKS on my phone might not work for yours. So as i said above, use my settings if you want, but if you have problems then tweak them to an effect your phone runs smoothly. Infact with my settings you get the balance of both worlds, Performance and battery life. But let me say this i am just providing you guys with my settings and what works for me. Now if you get any problems or errors which you should not do not come here crying as i have not forced these settings on anyone. The below settings are for people like myself who do not know how to use a script to tweak a governor, and by having this app makes life a lot easier and by me helping with my settings i hope it can provide the balance of good battery life and performance to people.
I know Geko95gek has his MagicConfig thread and my thread is different to his, as my thread is just to help people with the Lulzactive app settings and give them a guide on how to start and use it and how to get the best out off it. His is more to do with voltages of cpu and GPU. You can use his MagicConfig and use my Lulzactive apps settings if you want. Big shout out to him for his magic.
Please also follow the bottom link for a bit more in depth info on a How to guide for undervolting.(many thanks to Eric-filth)
http://forum.xda-developers.com/showthread.php?t=1532999
Anyway here are the settings that i use and please use as a guide:
Lulzactive app Settings:
inc_cpu_load: 75%
pump_up_step: 3
pump_down_step:2
screen_off_min_step: 4,@200MHz
up_sample_time: 50000
down_sample_time: 30000
debug_mode: 0
Setting up your Lulzactive app with your configurations:
To be able to use the above settings as already stated you need the Lulzactive application were it can be found here:https://play.google.com/store/apps/details?id=com.tegrak.lulzactive&hl=en.
Once you have installed it then you need to have Voltage Control which i recommend or any other cpu tuner program installed on your phone like(SetCpu, NoFrills, Tegrak OC) to be able to set lulzactive governor as default.
Once you have done that then go ahead and input my settings or your own. The exact way i have it laid out, is the same on the app.
Once you have done inputting the settings always make sure you have SET ON BOOT ticked.
Come out of the app and reboot. Wait for the phone to load up properly then go back into the application to make sure the settings have been set up properly and stayed. And that is it. :
​
Voltage Control Configuration:
*Governor: Lulzactive (of course)
*Scheduler: VR - Noop
Voltages​
1200Mhz - 1150mV
1000Mhz - 1050mV
800Mhz - 1000mV
500Mhz - 950mV
200Mhz - 900mV
100Mhz - 850mV​​
GPU Control​Low power state - High power estate​114Mhz - 950mV / 267Mhz - 1050mV​
Now i will present to you settings that you can use with a different governor and scheduler. Call this Rock Solid Config v1.1 if you like.​
Voltages
1200Mhz - 1175mV
1000Mhz - 1100mV
800Mhz - 975mV
500Mhz - 950mV
200Mhz - 850mV
100Mhz - 850mV​
GPU Control:​Low Power state: 133Mhz - 900mV
High Power State: 267Mhz - 1000mv
Scheduler: Noop
Governor: Conservative
Misc Tweaks: Ext4 Boost- Sched_Mc​
So there you have it. Those are my settings that i use currently with NEAK kernel and work like a charm for me. Feel free to use my configuration if you like but please consider that everyones phone is different. So feel free to use mine as a guide and either feel free to undervolt more if you like or if you find that you are getting freezes then up the steps by either 25mV or 50mv
Feel free to post your results here as i would like to know if my settings work or not and also your battery results to show if my settings actually do something towards your battery.
Just a few thanks in order as well i think:
Simone201: for his awesome kernel and configurator.
Tegrak: For his awesome lulzactive app(makes my life alot easier to tweak it this way instead of scripts)
Gokhanmoral: just for his siyah kernel and i have all the time in the world for that guy as he is a legend in my eyes
Geko95gek: for being just a crazy ass Yoda and providing everyone with his MagicConfig
GC and LeoMar75: For the awesome rom
So_ony: cause i have to say it was her idea behind this brainchild of a thread.
Droidphile: For his awesome thread regarding all the information you need regarding kernels
And to you all who keep pestering me for my settings this thread is for you guys.

Information on misc tweaks, plus my favorite governors and schedulers i recommend
Abit more info regarding what are the misc options in the NEAK configurator application. (Many thanks to Droidphile for all the information)
Q. "What are these modes: IDLE, LPA and AFTR?"
A. Between screen off and deep sleep states, there are some idle modes supported by cpuidle driver. They are IDLE aka Normal Idle, LPA aka Deep Idle and AFTR aka ARM Off Top Running. Race to idle by CPU is implemented for power management.
In IDLE state, CPU is not clocked anymore, but no hardware is powered down.
In deep idle (LPA),a state after IDLE, again, the cpu is not clocked anymore like we guessed but some parts of hardware are powered down. Deep idle brings in real power savings and there is no need of putting a hard limit to frequency during screen-off; using a screen-off profile. (Good practice is to use a governor with built in screen off profile, than using an user-configured screen-off profile by putting a hard limit on frequency). Deep idle is not used when device is entering deep sleep and also when device is woken from suspend/deep sleep. While entering/exiting DEEP IDLE, CPU is set statically to SLEEP_FREQ and is not clocked below or above until it exits this state.
AFTR is a patch to support Top=Off mode for deep idle. Level 2 cache keeps it data during this mode.
We can have IDLE or AFTR modes with LPA enabled or disabled. (Obviously it is not possible to have IDLE and AFTR together)
Values:
0: IDLE
1: AFTR
2: IDLE+LPA
3: AFTR+LPA
Q. "What idle modes are recommended for power saving? How do i change it"?
A. Recommended for power saving is to enable AFTR and LPA, ie value 3
Example:
echo "3" > /sys/module/cpuidle/parameters/enable_mask
Q. "What is sched_mc?"
A. Linaro team invented sched_mc or Schedule Multi Core to make process scheduling multi-core aware. ie, utilize both cores wisely to save power and balance performance. Even though sched_mc is sort of an alternative to cpu hot plugging, we can use sched_mc with the default hot plug mode.
Possible Values:
0 : No power saving load balance, default in our exynos4210 Soc.
1 : Fill one thread/core/package first for long running threads. In our single-CPU dual-core device, multithreading does not come into picture, so load balancing is almost redundant to hotplugging.
2 : Also bias task wake-ups to semi-idle CPU package for power savings. (Bias new tasks to cpu1 if cpu0 is mostly filled with running tasks). This is 'overloading' CPU0 first.
Q. "What value is recommended for sched_mc?"
A. 1) If you find advantages to sched_mc, use sched_mc=1 for a possible battery saving. Anyhow since load-balancing is reduntant on hotplugging, it may not have any advantage on exynos chip.
2) For performance use 2. But do remember that loading CPU0 and leaving CPU1 can not do justice to hitting deep idle states sooner since second core can not enter deep idle. So extra performance or no performance, value 2 will drain some more battery, in the context of delayed didle.
3) To do justice to hotplugging, use value 0.
Example:
echo "0" /sys/devices/system/cpu/sched_mc_power_savings.
Schedulers that i recommend to use. Again massive thanks to Droidphile for the information.
Noop
Inserts all the incoming I/O requests to a First In First Out queue and implements request merging. Best used with storage devices that does not depend on mechanical movement to access data (yes, like our flash drives). Advantage here is that flash drives does not require reordering of multiple I/O requests unlike in normal hard drives.
Advantages:
Serves I/O requests with least number of cpu cycles. (Battery friendly?)
Best for flash drives since there is no seeking penalty.
Good throughput on db systems.
Disadvantages:
Reduction in number of cpu cycles used is proportional to drop in performance.
V(R)
Unlike other schedulers, synchronous and asynchronous requests are not treated separately, instead a deadline is imposed for fairness. The next request to be served is based on it's distance from last request.
Advantages:
May be best for benchmarking because at the peak of it's 'form' VR performs best.
Disadvantages:
Performance fluctuation results in below-average performance at times.
Least reliable/most unstable.
Governors that i recommend to use. Information again by Droidphile.
Lulzactive:
This new find from Tegrak is based on Interactive & Smartass governors and is one of the favorites.
Old Version: When workload is greater than or equal to 60%, the governor scales up CPU to next higher step. When workload is less than 60%, governor scales down CPU to next lower step. When screen is off, frequency is locked to global scaling minimum frequency.
New Version: Three more user configurable parameters: inc_cpu_load, pump_up_step, pump_down_step. Unlike older version, this one gives more control for the user. We can set the threshold at which governor decides to scale up/down. We can also set number of frequency steps to be skipped while polling up and down.
When workload greater than or equal to inc_cpu_load, governor scales CPU pump_up_step steps up. When workload is less than inc_cpu_load, governor scales CPU down pump_down_step steps down.
Example:
Consider
inc_cpu_load=70
pump_up_step=2
pump_down_step=1
If current frequency=200, Every up_sampling_time Us if cpu load >= 70%, cpu is scaled up 2 steps - to 800.
If current frequency =1200, Every down_sampling_time Us if cpu load < 70%, cpu is scaled down 1 step - to 1000.
Conservative:
A slower Ondemand which scales up slowly to save battery. The conservative governor is based on the ondemand governor. It functions like the Ondemand governor by dynamically adjusting frequencies based on processor utilization. However, the conservative governor increases and decreases CPU speed more gradually. Simply put, this governor increases the frequency step by step on CPU load and jumps to lowest frequency on CPU idle. Conservative governor aims to dynamically adjust the CPU frequency to current utilization, without jumping to max frequency. The sampling_down_factor value acts as a negative multiplier of sampling_rate to reduce the frequency that the scheduler samples the CPU utilization. For example, if sampling_rate equal to 20,000 and sampling_down_factor is 2, the governor samples the CPU utilization every 40,000 microseconds.
Lionheart:
Lionheart is a conservative-based governor which is based on samsung's update3 source. Tweaks comes from 1) Knzo 2) Morfic. The original idea comes from Netarchy. See here. The tunables (such as the thresholds and sampling rate) were changed so the governor behaves more like the performance one, at the cost of battery as the scaling is very aggressive.
Lionheart goes well with deadline i/o scheduler. When it comes to smoothness (not considering battery drain), a tuned conservative delivers more as compared to a tuned ondemand.
Do not forget to enable the Lionheart tweaks you must have Conservative governor enabled through the configurator application and then select Lionheart tweaks
Links
*N.E.A.K kernel:
http://forum.xda-developers.com/showthread.php?t=1411788
*Droidphile thread regarding more info about governors and schedulers and more tweaks
http://forum.xda-developers.com/showthread.php?t=1369817
*Ext4 Optimization information
http://kernelnewbies.org/Ext4
*N.E.A.K Configurator App.
https://play.google.com/store/apps/details?id=com.neak.NEAK_Configurator
*If you want to try alternative settings from mine and try settings near stock default go to the following thread by Geko95gek and check his great thread out.
http://forum.xda-developers.com/showthread.php?t=1466017

And your voltage conttol settings??
Tapatalk on SGSII (Powered by CheckROM RevoHD V6, SiyahKernel 2.6.12 + MagicConfig 0.3.1, Modem KI4)

edwardeutsch said:
And your voltage conttol settings??
Tapatalk on SGSII (Powered by CheckROM RevoHD V6, SiyahKernel 2.6.12 + MagicConfig 0.3.1, Modem KI4)
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start with the MagicConfig mate. That should be good enough.

Great thread to start tweaking with Lulzactive governor. Should make life easier for a lot of people, gives them the opportunity to gain extra battery juice without too many headaches.

geko95gek said:
Great thread to start tweaking with Lulzactive governor. Should make life easier for a lot of people, gives them the opportunity to gain extra battery juice without too many headaches.
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Thanks mate. And with your magic config people can have the best of both worlds. Shame we can't merge the two...Anyway thanks mate much appreciated for your kind words

Why pump up 4 steps? For performance or? The rest of the settings i can see the meaning in, but why pump up four steps?
Else, awesome thread! God starting point for many!

Pennywice said:
Why pump up 4 steps? For performance or? The rest of the settings i can see the meaning in, but why pump up four steps?
Else, awesome thread! God starting point for many!
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Thanks mate...For performance yes but also if you see the other settings you will see they are leaning more towards the battery side. Hence why i wanted to go for a balance between the two if that makes sense. I will be trying different settings and i will provide screenshots of my results and will provide the settings for each result i do.

Stifler69 said:
Thanks mate. And with your magic config people can have the best of both worlds. Shame we can't merge the two...Anyway thanks mate much appreciated for your kind words
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i see you have listen to me and you have opened a new thread nice mate

so_ony said:
i see you have listen to me and you have opened a new thread nice mate
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check OP

Stifler69 said:
check OP
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oh how cute thanks hehe =) geko didn't answer my email :/
your description is short but everything is described very well !

so_ony said:
oh how cute thanks hehe =) geko didn't answer my email :/
your description is short but everything is described very well !
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any ideas on how to get this thread going please let me know..and glad you liked my OP

so_ony said:
oh how cute thanks hehe =) geko didn't answer my email :/
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So sorry for the delay. Please feel free to punish me.

I want understand one thing sorry my noobless.
What magic have in magicConfig from geko?
Enviado do meu nokia 3320 modificado por laboratório usando Tapatalk

great...now something to use when im on check and neak...nice work stiffy!!!

Good work Stifler, im trying your magic configuration and it Owns..!! Just right now im experiencing a little more battery drain against just the +conservative+lionheart+ext4+AFTR config.
Ill give it some days with full charge and check.

Stifler69 said:
Anyway here are the settings that i use and use as a guide:
Lulzactive app Settings:
inc_cpu_load: 95%
pump_up_step: 4
pump_down_step:1
screen_off_min_step: 4,@200MHz
up_sample_time: 20000
down_sample_time: 40000
debug_mode: 0
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Out of curiosity what are the default Lulzactive settings on NEAK 1.4 compared to those above???

Those lulzactive setting seem to be replicated from ThunderBolt! ain't it. Down to the last setting :/

pikachu01 said:
Those lulzactive setting seem to be replicated from ThunderBolt! ain't it. Down to the last setting :/
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Hey mate. Actually I have never seen you around on any posts sharing these settings or even opened thunderbolt scripts to see how you tweak lulz governor. I have nothing but for respect for you Pika as I see how great you thread is and how popular your scripts are. These settings that I am using are a start up from me from playing around with the app and sharing my findings with friends. If it brings offence to you I will bring it down. But I swear to you I have never used your scripts as one I do not how to use them and two I prefer apps to do the work for me as I hate to many scripts in my phone. I would love your help here if possible on what to help people though

eric-filth said:
I want understand one thing sorry my noobless.
What magic have in magicConfig from geko?
Enviado do meu nokia 3320 modificado por laboratório usando Tapatalk
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well just take a look at his thread my friend. his voltage control settings are shared nearly by 700 users on xda and have reported nothing but good stuff from it. i do not want to share my settings as i Undervolt quite heavy so my settings would not work with most on here. so i used his thread for people who would ask for settings apart from my lulz app ones.
jermitano said:
great...now something to use when im on check and neak...nice work stiffy!!!
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Thanks mate. first post settings are just a start up. i will be trying different settings with different kernels and still use Lulzactive as i want to show people my results and they can choose what settings to go for. i will always post a little review as well so users can decide which one to go for.
Honchay said:
Good work Stifler, im trying your magic configuration and it Owns..!! Just right now im experiencing a little more battery drain against just the +conservative+lionheart+ext4+AFTR config.
Ill give it some days with full charge and check.
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You would get a bit of drain my friend but again it is all about how you have your phone setup and what settings in VC you are using. but hope the settings have some benefit for you though
kersey said:
Out of curiosity what are the default Lulzactive settings on NEAK 1.4 compared to those above???
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not sure mate.