My cpu1 always online when screen is on,but when screen if off, cpu1 offline.
I thinks that samsung make it in order to make system response smoother,but it also drain battery.
maybe that function is enabled by some binary in system/bin like mpdecision or something else?
I think the Snapdragon 805 itself has this configuration.
Lodix said:
I think the Snapdragon 805 itself has this configuration.
Click to expand...
Click to collapse
This is the first 805 device I used，but in other 801 device the cpu1 is not forced online when screen on.
Devries said:
This is the first 805 device I used，but in other 801 device the cpu1 is not forced online when screen on.
Click to expand...
Click to collapse
Snapdragon 801 and 805 are not the same. The Galaxy S5 LTE-Advanced also has this set up.
Related
Does anyone remember Eco Mode on the Optimus G? As far as I know, when it's activated, the APQ8064 (4xKrait 200 + Adreno 320) runs like a MSM8960T (2xKrait 200 + Adreno 320), shutting off two cores. People said that it made a large impact on battery life but performance was more or less unaffected (probably offloads more rendering to the GPU).
I saw in this thread that the OP managed to add Eco Mode to the ATT stock ROM but it says "WIP - doesn't show UP" of which I have no clue what it's supposed to mean.
the changelog says WIP for v1 alpha but for v2 and v3 it doesn't make any mention of it. Has anyone tried out the mod?
Interesting. The battery saver I this phone is useless, this world be great.
Typically unless am added feature it's mentioned as being reduced it should still be there.
I'm going to think that while it's chimed into the system.ui there's no switch to activate it. Possible a needed app.
ECO Mode on the OG did not turn off 2 cores. It just significantly throttled the way the cpu ramped up to higher frequency.
Elisha said:
ECO Mode on the OG did not turn off 2 cores. It just significantly throttled the way the cpu ramped up to higher frequency.
Click to expand...
Click to collapse
Really? I heard reports of it either shutting 2 cores or changer governor to conservative or something
I run ECO mode quite often. Governor stays the same. It just spends more time at 594mhz as its intermediary frequency than 1134mhz. It also hits max frequency sparingly.
You can see the difference in cpuspy or even using CPU-Z real time core frequencies. Shows you what each core is running at.
I have some question about cpu cores. I searched for them in net but can't find good answer. I posted this thread in s3 neo forum because i want to about cpu cores of s3 neo plus.
what is exactly cpu cores? are they different parts of cpu or they are just different virtually?
Is running one core in 600mhz will use same amount of power used to run two core at 300 mhz?
can one core of cpu can get damaged while the other cores are working fine?
can i run different cpu in different frequency?
if i turn off all core except one will there is a chance that it will get damaged or lower its lifetime?
what i mean to say is does turning off some cores effect the whole cpu of affect some parts of cpu?
does cpu cores use different parts of cpu or every core can use whole cpu?
I am a newbie so if i have done some mistake asking those questions please forgive me because i am new in this forum and i dont know all the rules. and sorry for my bad english.
1) Cores are separate processing units built into the CPU. They are not virtual.
2) Power usage depends more on the CPU itself than the core speeds. I'm not sure about this question, but I would assume that multiple cores would consume slightly more power, but it's more than likely a negligible amount.
3) I would assume so, but I've never heard of such an occurrence. I would think that if one core dies, the whole CPU would be rendered useless.
4) If you're asking whether you can have separate cores running at different speeds, then no. There are apps that let you disable and enable cores though. You can also overclock (or downclock) core frequencies with specially designed kernels (of course you'll have to root your phone). So theoretically you could boost up a 1.4ghz quad core CPU to a 1.5ghz or more, with an appropriate hit on battery life and temperature.
5) I doubt it. But your phone will be very, very slow. And forget about multi-tasking.
6) It'll affect the whole CPU. While cores are separate parts, they are built into the central unit itself, so powering on a core powers the whole CPU.
Hello,
My galaxy S4 i9500 has 8 cores but can use only 4 at the same time.
Phone cores specifications:
Quad-core 1.2 GHz Cortex-A7
Quad-core 1.6 GHz Cortex-A15
I think that governor only use Cortex-A7, even when its getting heat up to 70-80 celsius degrees because of high mhz.
Other thing CPU-Z shows that my phone has Quad-core 1.6 GHz Cortex-A7 and Quad-core 1.6 GHz Cortex-A15.
In cpu-z i have seen that my phone was using up to 1600 mhz per core with getting heat like i said even to 80 celsius degrees using only browers.
I found one app called "Galaxy devices power saver" and this app see "cpu 1" and "cpu 2". I changed cpu 1 max mhz to 800 and now phone max degree is 60 , but cpu 2(i think its cortex-a15) is turned off somehow. There is option to set governor each for cpu 1 and cpu 2. In cpu 1 i can set from list which governor i want but in cpu 2 the list is empty.
Sorry for bad english.
Thanks in advance.
Our CPU uses A7 core when idle for battery saving. A15 core will be used for processes that requires high performance CPU.
Your CPU might not use A15 core at all due to your app behavior.
Sent from my ASUS_Z00A using XDA Labs
lol
is it possible to fix it?
nevonsky said:
is it possible to fix it?
Click to expand...
Click to collapse
You could try to revert all settings you made with that app.
Sent from my ASUS_Z00A using XDA Labs
krasCGQ said:
You could try to revert all settings you made with that app.
Sent from my ASUS_Z00A using XDA Labs
Click to expand...
Click to collapse
yesterday my phone again got 70 degrees without reason in movie player, then i opened app "kernel auditor" and the degree dropped suddenly to 50. this app somehow changed cores from a7 to a15, whats wrong is with my phone?
nevonsky said:
yesterday my phone again got 70 degrees without reason in movie player, then i opened app "kernel auditor" and the degree dropped suddenly to 50. this app somehow changed cores from a7 to a15, whats wrong is with my phone?
Click to expand...
Click to collapse
Like I said, our CPU will switch to A15 core when a high performance app is running. If your phone is idle, A7 core will be used instead.
About temperature:
CPU temperature is constantly changing. It won't stay on the same value for a long time.
Sent from my ASUS_Z00A using XDA Labs
Hi all,
I have cpu z installed and I'm not rooted. It generally uses all 8 cores but when I accidentally opened it I saw that it was only using 4 cores. I decided to restart and it is still using 4 cores. Is this normal because my g5 plus always uses all 8 cores.
Your in low power or battery saver mode... look at the battery symbol.. I can't remember if it kicks in at 5% or 15% battery automatically, then turns off when you connect the charger... It sometimes takes a few minutes for everything to kick back in. I would bet after getting a decent charge it was back to normal?
There is also a issue with Nougat at newer reporting CPU usage incorrectly even in rooted devices... been talked about a lot, something in the stock Moto firmware (or maybe that was a different Moto, I get them confused sometimes).
Ok thanks. Apparently cpu z was wrong.
the cores are reduced to 4 when u are on battery saver.
On thanks. The weird part was I didn't turn the battery saver.
DarthMaul14 said:
On thanks. The weird part was I didn't turn the battery saver.
Click to expand...
Click to collapse
It's automatic at a certain battery level by default.
Oh ok. Does the same thing apply for quad cores and hexacores.
DarthMaul14 said:
Oh ok. Does the same thing apply for quad cores and hexacores.
Click to expand...
Click to collapse
It will throttle them, although the exact implementation varies somewhat depending on the actual processor. littleBIG architecture tends to be that the BIG cores get shutdown, on more standard architecture like the SD625 they will get throttled to 50-75% of maximum speed, and others may just get a couple random cores disabled, it depends on the CPU and how Qualcomm/MediaTek/whoever engineered it.
Ok thanks!
I am user who watches YouTube most of the time and I looked into BBS and CPU is running about 600 MHz at all 8 cores all the time when I watch videos. I guess thats a lot and it drains my battery. Is it somehow possible to set the lowest clock about 300 MHz when I am watching YouTube? Or just shutdown 4 cores at least? I guess I will need root for that. Thanks
As you can see, I was watching YT for about 4 hours and most of the time was CPU running at 653 MHz, not lower.
600 mhz is the lowest you can get with stock kernel
I believe some kernels (Extreme kernel / Project K) allow you to set it to 300 mhz
berezker said:
600 mhz is the lowest you can get with stock kernel
I believe some kernels (Extreme kernel / Project K) allow you to set it to 300 mhz
Click to expand...
Click to collapse
Great! But is it still possible somehow in stock kernel? With magisk and some kernel apps like kernel adiutor?
TrueMS said:
Great! But is it still possible somehow in stock kernel? With magisk and some kernel apps like kernel adiutor?
Click to expand...
Click to collapse
You need an custom kernel. However, the 300mhz is slightly too low. Making music laggy and distorted when turning off the display.
TrueMS said:
Great! But is it still possible somehow in stock kernel? With magisk and some kernel apps like kernel adiutor?
Click to expand...
Click to collapse
Nope. You need a custom kernel
Most of the devs are already getting rid of OC/UC on their kernels, F.Y.I
Instead of lowering your clock speed try disabling four cores and reduce the max frequency. Set governor to conservative. If you want more power saving use powersave. Warning: performance will degrade heavily.
Edit: skipped over your mention of disabling four cores. Still it's a valid choice. I do it in extreme case.
It's not needed for our Mi A1 i think...
Somehow are there cuskernel to enable biglittle
RisjadB said:
Somehow are there cuskernel to enable biglittle
Click to expand...
Click to collapse
We don't have big.LITTLE. because of 8 cores it shows two clusters of 4 cores as big and little.
alkesh95 said:
We don't have big.LITTLE. because of 8 cores it shows two clusters of 4 cores as big and little.
Click to expand...
Click to collapse
What about hotplug.... Never see any core stop @Cpu-z... Rip battery
RIP battery what, the Snapdragon 625 is a very efficient chip. Most modern chips nowadays provide zero to negative impact on the battery life with active intensive core hotplugging.
This soc consumes almost nothing, not worth at all to downclock/downvolt.