Difference between revisions of "CPU Frequency Governor Linux"

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(Archlinux)
(Archlinux)
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==Notes==
 
==Notes==
 
*https://wiki.archlinux.org/index.php/CPU_Frequency_Scaling
 
*https://wiki.archlinux.org/index.php/CPU_Frequency_Scaling
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 +
==Debian==
 +
 +
Debian was different.  It uses an old kernel but I already had cpufrequtils installed and it was configured to be up and running.  It may be because on install I selected laptop utils.  I do not remember.
 +
 +
I wanted performance and I did:
 +
echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
 +
I still had to keep the change perm across reboots so I edited /etc/sysfs.conf with:
 +
devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
 +
 +
==Notes==
 +
*http://wiki.debian.org/HowTo/CpuFrequencyScaling
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*http://idebian.wordpress.com/2008/06/22/cpu-frequency-scaling-in-linux/

Revision as of 13:43, 22 July 2012

Debian and Archlinux use: cpufrequtils

Archlinux

I had to manually configure:

Options:

cpufreq_ondemand (default and recommended)

Dynamically switches between the CPU(s) available clock speeds based on system load

cpufreq_performance

The performance governor runs the CPU(s) at maximum clock speed

cpufreq_conservative

Similar to ondemand, but the CPU(s) clock speed switches gradually through all its available frequencies based on system load

cpufreq_powersave

Runs the CPU(s) at minimum speed

cpufreq_userspace

Manually configured clock speeds by user

Add to rc.conf:

MODULES=(... cpufreq_powersave cpufreq_userspace ...)

I have a new kernel as most archlinux users do and did not need to have the system autoload the modules because they already are.

I use this laptop like a desktop but just in case I created some aliases to switch back and forth:

alias cpu.performance='sudo cpufreq-set -r -g performance'
alias cpu.ondemand='sudo cpufreq-set -r -g ondemand'
 /etc/conf.d/cpufreq 
Template error: are you trying to use the = sign? Visit Help:Template#Escape template-breaking characters for workarounds.

Notes

Debian

Debian was different. It uses an old kernel but I already had cpufrequtils installed and it was configured to be up and running. It may be because on install I selected laptop utils. I do not remember.

I wanted performance and I did:

echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

I still had to keep the change perm across reboots so I edited /etc/sysfs.conf with:

devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand

Notes