setcpu

#!/bin/bash
ID=`id -u`
if [ $ID != 0 ]; then
  exec sudo $0 $@ 
fi

print_available_governors() {
  echo -n "available governors are : "
  cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
  echo -n "current governor is : "
  cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
  echo
}

set_governor() {
  GOVERNOR=$1
  for F in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
  do
    echo $GOVERNOR > $F 2>&1 || print_available_governors || exit 1
  done
}

case "$@" in
  'p' | 'perf' | 'performance')
    GOVERNOR='performance'
    ;;
  's' | 'save' | 'powersave')
    GOVERNOR='powersave'
    ;;
  'u' | 'user' | 'userspace')
    GOVERNOR='userspace'
    ;;
  'c' | 'cons' | 'conservative')
    GOVERNOR='conservative'
    ;;
  *)
    echo "Usage: $0 GOVERNOR"
    echo
    print_available_governors
    exit 1
    ;;
esac

set_governor $GOVERNOR