Develop Bugs

Shutdown cpu cores when low usage

I have been using Yureka for few days and see that cpu cores are always on, irrespective of load. Is anyone working on a kernel which can shutdown 4-6 cores when idle or when screen off? I think this would be great for batter.

Try Cpu Tuner, it has options for profiles and to turn off CPU cores after digging into some settings to enable it as far as i remember.

I am using it. However, the current kernel (as well as Sandy) does not support core shutdown so none of the apps have this option. CPU tuner will scale down frequencies to what i want but all 8 cores are always running.

Like this?

How did you shut down the cores please tell us..
Sent from my YU Yureka using XDA Free mobile app

Sudeep Duhoon said:
Like this?
Click to expand...
Click to collapse
bro how this possible ??

It is achieved with the help of CPU Tuner app. I am using it since I got my Yureka.

Jimmyz0r said:
It is achieved with the help of CPU Tuner app. I am using it since I got my Yureka.
Click to expand...
Click to collapse
CPU tuner is rooted or unrooted app??

Panneer Selvam said:
CPU tuner is rooted or unrooted app??
Click to expand...
Click to collapse
Rooted.

Thanks Bro...
Sent from my YUREKA using XDA Free mobile app

Can you share your configuration from CPU Tuner? I can't any option in cpu tuner to shut down cores. Only governors and their affinity settings.

rApt0r7 said:
Can you share your configuration from CPU Tuner? I can't any option in cpu tuner to shut down cores. Only governors and their affinity settings.
Click to expand...
Click to collapse
"Simple and Powerful" Config with "Power User" profile.

My CPU tuner was working in non power user mode . Thanks for the info. I can control cpu cores now.
Now only if someone makes a kernel with more governors and automatically shut down cores on low usage . It seem cpu tuner only allows me to set number of cores for a profile.

rApt0r7 said:
I have been using Yureka for few days and see that cpu cores are always on, irrespective of load. Is anyone working on a kernel which can shutdown 4-6 cores when idle or when screen off? I think this would be great for batter.
Click to expand...
Click to collapse
If I am wrong correct me, if I have understood what you are trying to say, you most probably wish to use the feature where the idle cpu cores are shutdown once the load is not that much.
In my knowledge, that's 'Hotplugging' right ?? coz it more or less does the same function. Try installing some custom kernel that provide you with some really good hotplugging governers. And coz the development for yureka is really in it's full form, there have been few kernels that have been posted in the "Original Android Development" section of our xda forums. Try going through them, you will find what you are looking for !

hkm93 said:
If I am wrong correct me, if I have understood what you are trying to say, you most probably wish to use the feature where the idle cpu cores are shutdown once the load is not that much.
In my knowledge, that's 'Hotplugging' right ?? coz it more or less does the same function. Try installing some custom kernel that provide you with some really good hotplugging governers. And coz the development for yureka is really in it's full form, there have been few kernels that have been posted in the "Original Android Development" section of our xda forums. Try going through them, you will find what you are looking for !
Click to expand...
Click to collapse
Yes sir, hotplugging kernel is what i am looking for. Last time i checked, there was just Sandy kernel which did not had this. It seems there are a couple more now . I will give them a shot and update.

rApt0r7 said:
Yes sir, hotplugging kernel is what i am looking for. Last time i checked, there was just Sandy kernel which did not had this. It seems there are a couple more now . I will give them a shot and update.
Click to expand...
Click to collapse
WHICH KERNEL u r using for hotplugging?

Does my P-600's all cores working?

Hello, in my device running Exynos 5420. This cpu have 8 cores. Why when I running cpu-z app it shows only 4 cores - 0,1,2,3 cores. Where another 4 (Cortex A7)?
I attached screenshot.
https://www.dropbox.com/s/npshqo2wtnlqomm/Screenshot_2016-12-23-17-12-38.jpg?dl=0
Thanks for advices.

Sunrise2000 said:
Hello, in my device running Exynos 5420. This cpu have 8 cores. Why when I running cpu-z app it shows only 4 cores - 0,1,2,3 cores. Where another 4 (Cortex A7)?
I attached screenshot.
https://www.dropbox.com/s/npshqo2wtnlqomm/Screenshot_2016-12-23-17-12-38.jpg?dl=0
Thanks for advices.
Click to expand...
Click to collapse
It's all the same everywhere ... I guess that's because KK and LL don't have the ability to use and control 8 cores at the same time ... The A7 small cores actually start working when system is doing demanding tasks ... As a Kernel Dev , I can confirm that the appropriate Drivers are implemented for both A7 and A15 Processors ... So , It should be just that the current Android Arch is not that compatible with 8 Core Control ... I guess It was said that in Nougat , the New arch does support full 8 Core control ... But , So far I haven't faced such features in related threads and i don't want to make you think that it would be GREAT to control 8 cores because currently TW's source does it by itself ... I hope it was helpful to you ...
With Best Wishes
Hitman1376​

Disable Cores Nexus 5x

Hello,
i want to ask if you can disable one or two cores before the system starts. I have the nexus 5x an have the google bootloop problem and the patch (https://forum.xda-developers.com/nexus-5x/general/untested-nexus-5x-bootloop-death-fix-t3641199) works but the patch disables poth A57 cores and if only one doesn't work i want to ask if there is any method to disable only one core.
Thanks.

works but the patch disables poth A57 cores and if only one doesn't work i want to ask if there is any method to disable only one core.
Click to expand...
Click to collapse
Actually, seems like the big cluster (2 a57 cores aka "big cores") is damaged (probably a crack inside the chip substratum).
But you can try unpacking your actual boot.img and search for the img-cmdline file, then, look for: boot_cpus=0-3 and change it to: boot_cpus=0-4. Repack and install.

Trovato said:
Hello,
i want to ask if you can disable one or two cores before the system starts. I have the nexus 5x an have the google bootloop problem and the patch (https://forum.xda-developers.com/nexus-5x/general/untested-nexus-5x-bootloop-death-fix-t3641199) works but the patch disables poth A57 cores and if only one doesn't work i want to ask if there is any method to disable only one core.
Thanks.
Click to expand...
Click to collapse
The guy who made the patch said he tried disabling only some cores on his 6p but it was unsucsessful.

Why Cpu All Core Working Without Use Any App?

Cpu Every Core Working Without Use Any App in Recent List

It shows 633Mhz for me (first four cores)
which rom you are on ?
however background processes of Android do take cpu usage

YasuHamed said:
It shows 633Mhz for me (first four cores)
which rom you are on ?
however background processes of Android do take cpu usage
Click to expand...
Click to collapse
I Think Other Core Should Stop When Not Use Any App in Recent

I does not seem to work like that. I have never seen my Redmi having a single idle CPU core
Sent from my whyred using XDA Labs

RupeshRN said:
I Think Other Core Should Stop When Not Use Any App in Recent
Click to expand...
Click to collapse
You think wrong

RupeshRN said:
I Think Other Core Should Stop When Not Use Any App in Recent
Click to expand...
Click to collapse
stock min freq is little 633 mhz big 1130mjz
underclocked can go to 300mhz both big and little.
you mean a hotplug.. when not in use all cores off then whn input turn on... unfortunatelly theres no hotplug for 636.. as they say in kernel settings balme qualcomm

How low can I set the processor frequency to in rooted Samsung Galaxy J2 Pro - SM-J210F?

I have rooted my Samsung Galaxy J2 Pro - SM-J210F. How low can I set the frequency?
Currently it shows only 5 presets - 768 MHz, 900 MHz, 1200 MHz, 1350 MHz, 1500MHz
What is the best possible lowest processor frequency so that my phone does not reboot or freeze?
Also how can I enable hotspot in ultra power saver mode.

IMO the lowest network frequency setting depends on what network frequency band is used: GSM and/or HSDPA and/or LTE.

jwoegerbauer said:
IMO the lowest network frequency setting depends on what network frequency band is used: GSM and/or HSDPA and/or LTE.
Click to expand...
Click to collapse
Sorry its about the processor frequency that I mean to ask.

xyzqwerty500 said:
Sorry its about the processor frequency that I mean to ask.
Click to expand...
Click to collapse
So that the readers here don't think I was completely wrong: both thread's title and OP have been re-written accordingly.

xyzqwerty500 said:
I have rooted my Samsung Galaxy J2 Pro - SM-J210F. How low can I set the frequency?
Currently it shows only 5 presets - 768 MHz, 900 MHz, 1200 MHz, 1350 MHz, 1500MHz
What is the best possible lowest processor frequency so that my phone does reboot or freeze?
Also how can I enable hotspot in ultra power saver mode.
Click to expand...
Click to collapse
You could use an app from play store like Performance Tweaker

xyzqwerty500 said:
I have rooted my Samsung Galaxy J2 Pro - SM-J210F. How low can I set the frequency?
Currently it shows only 5 presets - 768 MHz, 900 MHz, 1200 MHz, 1350 MHz, 1500MHz
What is the best possible lowest processor frequency so that my phone does reboot or freeze?
Click to expand...
Click to collapse
Only a false undervolting can lead to a freeze / reboot: the mentioned clock frequencies are stock ones hence none of these will lead to a freeze / reboot, means you can apply the lowest one what is 768 MHz.

Venkata Lochan Nune said:
You could use an app from play store like Performance Tweaker
Click to expand...
Click to collapse
The Performance Tweaker app doesn't allow any other frequency besides these 5 stock frequencies. How can I safely lower below it, without changing to other rom or flashing a new kernel.

Whay
xyzqwerty500 said:
The Performance Tweaker app doesn't allow any other frequency besides these 5 stock frequencies. How can I safely lower below it, without changing to other rom or flashing a new kernel.
Click to expand...
Click to collapse
First, Why do you want to do that?

Venkata Lochan Nune said:
Whay
First, Why do you want to do that?
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Click to collapse
Because I want to lower my device battery usage when running?

xyzqwerty500 said:
Because I want to lower my device battery usage when running?
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Click to collapse
Hmmm. I once reduced it to the least possible preset because of an overheating issue but that just makes your device too laggy. So, I just don't recommend reducing it's frequency to a lower value. It might even cause crashes...

Venkata Lochan Nune said:
Hmmm. I once reduced it to the least possible preset because of an overheating issue but that just makes your device too laggy. So, I just don't recommend reducing it's frequency to a lower value. It might even cause crashes...
Click to expand...
Click to collapse
Oh, and how did you achieved it.
Also is undervolting possible in android? It really sucks the battery and I just use hotspot, minimally I use other apps.

xyzqwerty500 said:
Oh, and how did you achieved it.
Also is undervolting possible in android? It really sucks the battery and I just use hotspot, minimally I use other apps.
Click to expand...
Click to collapse
I've already mentioned that it was a preset(the least one of the 5 you've mentioned). That itself is too bad and making it even lower will be like you're using a phone from previous century. So, don't decrease your processor frequency.
If you need a better battery life, I recommend you to debloat your UI and then keep and check on background running tasks from developer options in settings. Did you try checking the background processes(not the recent apps one)?

Venkata Lochan Nune said:
I've already mentioned that it was a preset(the least one of the 5 you've mentioned). That itself is too bad and making it even lower will be like you're using a phone from previous century. So, don't decrease your processor frequency.
If you need a better battery life, I recommend you to debloat your UI and then keep and check on background running tasks from developer options in settings. Did you try checking the background processes(not the recent apps one)?
Click to expand...
Click to collapse
There it shows nothing. Something is wrong with android OS process and this shooting up of android os process battery usage is only after the root.
Check this please.
Stopping kernel WakeLocks, during mobile hotspot
This shooting up of android os process battery usage is only after the root. Google play services and other GAPPS have already been removed from the whitelist of power saving. I have been using my mobile hostpot for about 6 hours and 6 hours...
forum.xda-developers.com

xyzqwerty500 said:
There it shows nothing. Something is wrong with android OS process and this shooting up of android os process battery usage is only after the root.
Check this please.
Stopping kernel WakeLocks, during mobile hotspot
This shooting up of android os process battery usage is only after the root. Google play services and other GAPPS have already been removed from the whitelist of power saving. I have been using my mobile hostpot for about 6 hours and 6 hours...
forum.xda-developers.com
Click to expand...
Click to collapse
you mean rooting increases battery usage?

Venkata Lochan Nune said:
you mean rooting increases battery usage?
Click to expand...
Click to collapse
I cannot say in general but in my case it did increased the battery usage, and this happens only when I am using my mobile hotspot.
Only during that time, Android OS process spikes consumption.
Which rooted OS do you use, and how is the battery performance for it.

xyzqwerty500 said:
I cannot say in general but in my case it did increased the battery usage, and this happens only when I am using my mobile hotspot.
Only during that time, Android OS process spikes consumption.
Which rooted OS do you use, and how is the battery performance for it.
Click to expand...
Click to collapse
I'm using RROS based on android 7 on one and android 10 gsi on another. Both show a better battery performance than the stock roms. And the overall performance is also better.