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74 lines
2.7 KiB
Markdown
74 lines
2.7 KiB
Markdown
# Check or set the CPU frequency or governor
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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```sh
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# Check what governors are available.
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cat '/sys/devices/system/cpu/cpufreq/'*'/scaling_available_governors'
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# Get the current active governor.
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cat '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor'
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cat '/sys/devices/system/cpu/cpufreq/'*'/scaling_governor'
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# List the active CPUs affected by the current governor.
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cat '/sys/devices/system/cpu/cpufreq/'*'/affected_cpus'
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# Enable new governors.
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echo 'schedutil' | sudo tee '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor'
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echo 'powersave' | sudo tee '/sys/devices/system/cpu/cpufreq/policy1/scaling_governor'
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# Get the current frequency of CPUs.
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cat '/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq'
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cat '/sys/devices/system/cpu/cpufreq/'*'/scaling_cur_freq'
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# Do not boost the CPU frequency for niced loads.
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# The governor must support it - check if the file exists.
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echo 1 | sudo tee '/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load'
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# Disable (1) or enable (0) turbo boost for Intel CPUs.
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echo 1 | sudo tee '/sys/devices/system/cpu/intel_pstate/no_turbo'
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# Check what energy vs performance hint are available for CPUs.
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cat '/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences'
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# Get the current energy vs performance hint used by CPUs.
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cat '/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference'
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cat '/sys/devices/system/cpu/cpu'*'/cpufreq/energy_performance_preference'
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# Set energy vs performance hints.
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echo 'balance_performance' | sudo tee '/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference'
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echo 'power' | sudo tee '/sys/devices/system/cpu/cpu'*'/cpufreq/energy_performance_preference'
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```
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## Further readings
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- [`cpupower`][cpupower]
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- [Set the _ondemand_ CPU governor to not rise the frequencies for niced loads][set the ondemand cpu governor to not rise the frequencies for niced loads]
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## Sources
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All the references in the [further readings] section, plus the following:
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- [CPU performance scaling]
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- The [*intel_pstate* CPU performance scaling driver][intel_pstate cpu performance scaling driver]
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<!--
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References
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-->
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<!-- In-article sections -->
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[further readings]: #further-readings
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<!-- Knowledge base -->
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[cpupower]: cpupower.md
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[set the ondemand cpu governor to not rise the frequencies for niced loads]: set%20the%20ondemand%20cpu%20governor%20to%20not%20rise%20the%20frequencies%20for%20niced%20loads.md
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[tlp]: tlp.md
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<!-- Upstream -->
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[cpu performance scaling]: https://www.kernel.org/doc/html/latest/admin-guide/pm/cpufreq.html
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[intel_pstate cpu performance scaling driver]: https://www.kernel.org/doc/html/next/admin-guide/pm/intel_pstate.html
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