#cpufreq

Manually adjusting CPUs frequencies using sysfs cpufreq interface

Sysfs interface paths shown as of kernel ver. 4.15

Adjusting scaling governor

List available governors:

# cd /sys/devices/system/cpu/cpufreq /sys/devices/system/cpu/cpufreq# cat policy?/scaling_available_governors | uniq conservative ondemand userspace powersave performance schedutil

Load userspace governor to allow manual frequency setup:

/sys/devices/system/cpu/cpufreq# echo userspace > policy0/scaling_governor /sys/devices/system/cpu/cpufreq# echo userspace > policy1/scaling_governor

Adjusting CPU frequency

List available frequencies:

/sys/devices/system/cpu/cpufreq# cat policy?/scaling_available_frequencies | uniq 2401000 2400000 2000000 1600000 1200000 800000

Set up specific freq of choice:

/sys/devices/system/cpu/cpufreq# echo 2000000 > policy0/scaling_setspeed /sys/devices/system/cpu/cpufreq# echo 2000000 > policy1/scaling_setspeed

Verify current freq was actually set:

/sys/devices/system/cpu/cpufreq# cat policy?/cpuinfo_cur_freq | uniq 2000000 /sys/devices/system/cpu/cpufreq# grep -i mhz /proc/cpuinfo cpu MHz         : 1994.998 cpu MHz         : 1994.998