How to change the CPU escalator configuration that Ubuntu has originally

Question

I don't want a command line solution that includes installing anything at all. Ubuntu configures the CPU governor in a configuration file AFAIK. I want to locate and change the file correctly.

I don't want to disable the default governor instead, learn how to correctly set one.

A better question is what makes you think you need to change ? — Panther, Mar 22 '16 at 17:19
And another good question is why would this represent a disadvantage? — userDepth, Mar 22 '16 at 17:30
@user3005629 - Depends on how you set it and what you want to accomplish, no ? Running your CPU at full speed when it is not needed == watse of power and heat. Restricting ondemand means you are crippling your CPU. see https://wiki.archlinux.org/index.php/CPU_frequency_scaling and https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Power_Management_Guide/cpufreq_governors.html — Panther, Mar 22 '16 at 19:19

Doug Smythies · Accepted Answer · 2016-03-22T18:06:53.260

1

The file is /etc/init.d/ondemand.

Without any additional packages, you can manipulate the frequency scaling governors using primitive commands.

First, determine what available governors you have available:

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors

Perhaps see what you currently have:

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

And then, if different than what you want, just set one of the other available governors, in this example performance:

$ sudo su
# for file in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do echo "performance" > $file; done
# exit

Example:

$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors
performance powersave
performance powersave
performance powersave
performance powersave
performance powersave
performance powersave
performance powersave
performance powersave
$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave
powersave
powersave
powersave
powersave
powersave
powersave
powersave
$ sudo su
# for file in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do echo "performance" > $file; done
# exit
exit
$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
performance
performance
performance
performance
performance
performance
performance
performance

edited Mar 22 '16 at 18:06

answered Mar 22 '16 at 17:06

Doug Smythies

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A little more information please =) – Panther Mar 22 '16 at 17:20
@bodhi.zazen: Based on the edited question, I added more information. – Doug Smythies Mar 22 '16 at 18:52
Still gets overwritten, this is not changing the actual original configuration – userDepth Mar 22 '16 at 19:50
@user3005629: Put a sleep for 70 seconds into it. That way the ondemand script, that sleeps for 60 seconds will be finished first. – Doug Smythies Mar 22 '16 at 20:36
@DougSmythies I solved my immediate situation by changing the priority of the user instead. – userDepth Jul 16 '16 at 16:57

How to change the CPU escalator configuration that Ubuntu has originally

1 Answers1