Database Users

Does the stock firmware CPU Throttle?

I have been kicking around getting SetCPU to do some auto CPU throttling to help with battery life, but I'm uncertain if I actually would see a lot of improvement.
The reason I am unsure, is I installed some CPU info widgets, and they report a CPU frequency that already seems to throttle. Is it actually doing throttling or are the widgets just not accurate? If it is throttling, is there still a case to be made for SetCPU?
Thanks!

If you want something that's just set and forget, SetCPU alone will do very little to extend usage time.

The stock kernel does throttle the CPU.
SetCPU gives you control over how your (rooted) phone throttles it's CPU, it allows you to change the CPU governor, set minimum and maximum CPU speeds, or overclock with a compatible kernel.

CPU Spy will give you a break down of what speeds the CPU is using and how often.

thanks for the info!

[Q] what are governers

I heard some people talking about governors and was wondering if someone could explain the them to me. also what does Min CPU frequency and Max CPU frequency?

Min and Max frequency mean the Min and Max speed of the processor. So instead of running full speed for a minimal task it can be powered down as to not waste energy. The governor is what changes the speed of the processor in order to efficiently complete its task. Android is usually equipped with a few different governors each with a set of instructions on how to deal with those different tasks.
Does that help?

yes thank you, but I still don't know which one to have on. the one I have are ondemand, userspace, conservative and performance

Ondemand basically adjusts the speed to whats needed. Userspace does nothing from what I understand. Conservative keeps the CPU speed as low as it can to conserve energy but causes the device to be slow and sometimes unresponsive. Performance cranks up the CPU speed to tthe Max at all times.
I use Ondemand for most situations. Performance when my device is plugged in.

Thanks, that helps alot

No problem. This community has helped me out a great deal. I'm no expert so I try and help when I can.

[Q] AOKP Build 5 default cpu kernel settings?

Can someone tell me what the default values for the kernel that comes with build 5 are? I normally use Franco, but have been having some issues with it lately and want to try going back to regular kernel. After I flashed AOKP kernel back it shows the cpu settings as Minimum cpu 1026, On demand, and CFQ. I don't think those are right. I thought it was interactive with 384 min and deadline?
Any help would be appreciated. Thanks.

Hi,
All is fine. The 1026 Mhz min CPU freq is normal and it's like stock. It's for a "smoother experience" that when you touch the screen the min CPU freq goes to this freq for a time and after goes down to 384 Mhz, it's the Mpdecision stuff, some kernel devs have disable it for battery life and you can set the 384 Mhz freq as a minimum CPU freq "all the time" (related to the Cpu load). As for the governor it's Ondemand by defaut, i/o scheduler too.
Do a little search for more detailed information...
Nothing is wrong here...

Thanks for the confirmation!

need help with setCPU

so i wanna underclock my S4 for longer battery, so lets say i want to create a profile when the screen is off, i set it to 1000 MHz max and 250 MHz min. Now under 'Set CPU governor" does it matter what i set it as? the default is 'ondemand' whats that all mean? should i change it to 'powersave' or it does it really matter?

Powersave basically pushes your device to the 250-400 mhz range usually. Ondemand would fluctuate about your clock range based on background tasks. Are you using a stock kernel?? What other governors do you have?

AcreaperJB said:
Powersave basically pushes your device to the 250-400 mhz range usually. Ondemand would fluctuate about your clock range based on background tasks. Are you using a stock kernel?? What other governors do you have?
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Click to collapse
Im using adam kernel 1.5 for my galaxy S4 and stock kernel for my galaxy note 10.1. I just wanna set the cpu for screen off and when the battery is 50%. Whats a good range to set those on? and what governor?

Governors basically manage the cpu's behavior ( ondemand , powersave, etc. ) I don't use stock but I would use lowest freq (varies to chip) to 900 Mhz on conservative if you have it on your device.

[Q] change min cpu freq to lower than 384 MHz?

Stock min CPU freq is 384 MHz.
Is there a benefit of changing this to a lower frequency?
Better battery?

nadastry said:
Stock min CPU freq is 384 MHz.
Is there a benefit of changing this to a lower frequency?
Better battery?
Click to expand...
Click to collapse
I believe after a certain frequency the voltages become the same. Meaning it takes as much power to run a processor at 384MhZ than it does at per say 126MhZ
Sent from my SM-G900T using XDA Free mobile app

Yeah, I believe the above poster is correct, but even if there is a slight variation in voltages, the battery savings are negligent and not worth the possible instabilities or slow downs that result from running the device at a frequency that low. However, if you wish to give it a shot, flashing the hellscore kernel will allow you to drop the minimum frequency to 81 MHz. Please use with caution and make a backup if you choose to proceed.