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52 lines
2.6 KiB
Bash
52 lines
2.6 KiB
Bash
#!/bin/sh
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#
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# rc.cpufreq: Settings for CPU frequency and voltage scaling in the kernel.
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# For more information, see the kernel documentation in
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# /usr/src/linux/Documentation/cpu-freq/
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# Default CPU scaling governor to try. Some possible choices are:
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# performance: The CPUfreq governor "performance" sets the CPU statically
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# to the highest frequency within the borders of scaling_min_freq
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# and scaling_max_freq.
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# powersave: The CPUfreq governor "powersave" sets the CPU statically to the
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# lowest frequency within the borders of scaling_min_freq and
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# scaling_max_freq.
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# userspace: The CPUfreq governor "userspace" allows the user, or any
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# userspace program running with UID "root", to set the CPU to a
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# specific frequency by making a sysfs file "scaling_setspeed"
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# available in the CPU-device directory.
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# ondemand: The CPUfreq governor "ondemand" sets the CPU depending on the
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# current usage.
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# conservative: The CPUfreq governor "conservative", much like the "ondemand"
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# governor, sets the CPU depending on the current usage. It
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# differs in behaviour in that it gracefully increases and
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# decreases the CPU speed rather than jumping to max speed the
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# moment there is any load on the CPU.
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# schedutil: The CPUfreq governor "schedutil" aims at better integration with
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# the Linux kernel scheduler. Load estimation is achieved through
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# the scheduler's Per-Entity Load Tracking (PELT) mechanism, which
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# also provides information about the recent load.
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SCALING_GOVERNOR=ondemand
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# If rc.cpufreq is given an option, use it for the CPU scaling governor instead:
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if [ ! -z "$1" -a "$1" != "start" ]; then
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SCALING_GOVERNOR=$1
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fi
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# If you need to load a specific CPUFreq driver, load it here. Most likely you don't.
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#/sbin/modprobe acpi-cpufreq
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# Attempt to apply the CPU scaling governor setting. This may or may not
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# actually override the default value depending on if the choice is supported
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# by the architecture, processor, or underlying CPUFreq driver. For example,
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# processors that use the Intel P-state driver will only be able to set
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# performance or powersave here.
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echo $SCALING_GOVERNOR | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor 1> /dev/null 2> /dev/null
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# Report what CPU scaling governor is in use after applying the setting:
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if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ]; then
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echo "Enabled CPU frequency scaling governor: $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor)"
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fi
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unset SCALING_GOVERNOR
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