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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