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2558ca883b
The latter does not exist any more when "initscripts" falls out of the default installation. This now does not do a fixed one-minute wait but uses "Type=idle" instead. This also becomes a no-op when the CPU supports "intel_pstate" (≤ 5 years old), as on these the ondemand/powersave schedulers are actually detrimental. LP: #1584124 LP: #1579278
55 lines
1.5 KiB
Bash
Executable File
55 lines
1.5 KiB
Bash
Executable File
#! /bin/sh
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# Set the CPU Frequency Scaling governor to "ondemand"/"powersave" on old
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# machines which don't support intel_pstate yet.
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set -eu
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FIRSTCPU=`cut -f1 -d- /sys/devices/system/cpu/online`
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AVAILABLE="/sys/devices/system/cpu/cpu$FIRSTCPU/cpufreq/scaling_available_governors"
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DOWN_FACTOR="/sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor"
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[ -f $AVAILABLE ] || exit 0
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# more modern processors that support intel_pstate behave worse with
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# ondemand/powersave and should use performance
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if [ `cat /sys/devices/system/cpu/cpu$FIRSTCPU/cpufreq/scaling_driver` = intel_pstate ]; then
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echo 'CPU supports intel_pstate, keeping "performance"'
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exit 0
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fi
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read governors < $AVAILABLE
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case $governors in
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*interactive*)
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GOVERNOR="interactive"
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break
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;;
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*ondemand*)
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GOVERNOR="ondemand"
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case $(uname -m) in
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ppc64*)
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SAMPLING=100
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;;
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esac
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break
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;;
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*powersave*)
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GOVERNOR="powersave"
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break
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;;
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*)
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exit 0
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;;
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esac
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[ -n "${GOVERNOR:-}" ] || exit 0
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echo "Setting $GOVERNOR scheduler for all CPUs"
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for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
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do
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[ -f $CPUFREQ ] || continue
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echo -n $GOVERNOR > $CPUFREQ
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done
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if [ -n "${SAMPLING:-}" ] && [ -f $DOWN_FACTOR ]; then
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echo -n $SAMPLING > $DOWN_FACTOR
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fi
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