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Filename : set-cpufreq
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#! /bin/sh
# Set the CPU Frequency Scaling governor to "ondemand"/"powersave" where available
set -eu

FIRSTCPU=`cut -f1 -d- /sys/devices/system/cpu/online`
AVAILABLE="/sys/devices/system/cpu/cpu$FIRSTCPU/cpufreq/scaling_available_governors"
DOWN_FACTOR="/sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor"

[ -f $AVAILABLE ] || exit 0

read governors < $AVAILABLE
case $governors in
        *interactive*)
                GOVERNOR="interactive"
                break
                ;;
        *ondemand*)
                GOVERNOR="ondemand"
                case $(uname -m) in
                        ppc64*)
                                SAMPLING=100
                        ;;
                esac
                break
                ;;
        *powersave*)
                GOVERNOR="powersave"
                break
                ;;
        *)
                exit 0
                ;;
esac

[ -n "${GOVERNOR:-}" ] || exit 0

echo "Setting $GOVERNOR scheduler for all CPUs"

for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
do
        [ -f $CPUFREQ ] || continue
        echo -n $GOVERNOR > $CPUFREQ
done
if [ -n "${SAMPLING:-}" ] && [ -f $DOWN_FACTOR ]; then
        echo -n $SAMPLING > $DOWN_FACTOR
fi