Use the script below to set the min, max and CPU governor in Linux:
#!/usr/bin/env bash
MIN_FREQ=800000
MAX_FREQ=1000000
GOVERNOR=powersave
for i in `seq 0 3`;
do
echo ${GOVERNOR} > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor
echo ${MAX_FREQ} > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_max_freq
echo ${MIN_FREQ} > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_min_freq
done
do
echo ${GOVERNOR} > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor
echo ${MAX_FREQ} > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_max_freq
echo ${MIN_FREQ} > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_min_freq
done
Set the max number of cores accordingly.
Script requires the following packages to be installed:
- cpufrequtils
- cpufreqd
Run the command below to verify that the changes are applied:
$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 4294.55 ms.
hardware limits: 700 MHz - 3.40 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 754 MHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 4294.55 ms.
hardware limits: 700 MHz - 3.40 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 4294.55 ms.
hardware limits: 700 MHz - 3.40 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 4294.55 ms.
hardware limits: 700 MHz - 3.40 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 795 MHz.
