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'"