cpupower
sudo apt-get install linux-tools-$(uname -r) # to install
Info
cpupower -c 0,1,2,3 frequency-info
cpupower -c 0,1,2,3 frequency-info | grep CPU.*Hz # show current freq
Setting
powersave
#!/bin/bash
sudo cpupower frequency-set -d 800 -g powersave
performance
#!/bin/bash
sudo cpupower frequency-set -d 800 -g performance
ondemand
#!/bin/bash
sudo cpupower frequency-set -d 800 -g ondemand