cpufreq

The sysfs interface to cpu frequency settings and current state.

/sys/devices/system/cpu/cpu*/cpufreq/

cpupower(1)

A CLI interface to peek and poke the cpu frequency settings.

# Show current frequency of all cores.
cpupower -c all frequency-info -f -m

# Show currently set frequency governor.
cpupower -c all frequency-info -p

# List available frequency governors.
cpupower -c all frequency-info -g

# Change frequency governor to POWERSAVE (eg).
cpupower -c all frequency-set -g powersave

Example

Watch cpu frequency.

watch -n1 "cpupower -c all frequency-info -f -m | xargs -n2 -d'\n'"