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chore: better knowledge in the quest for power efficiency
This commit is contained in:
Michele Cereda
7
.vscode/settings.json
vendored
7
.vscode/settings.json
vendored
@@ -41,7 +41,9 @@
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"configmap",
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"containerd",
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"cowsay",
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"cpufreq",
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"cpulimit",
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"cpupower",
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"cryptsetup",
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"csma",
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"datagram",
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@@ -109,6 +111,7 @@
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"nvme",
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"ocsp",
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"odhcpd",
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"ondemand",
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"openpgp",
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"opkg",
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"pacman",
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@@ -122,6 +125,8 @@
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"portsnap",
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"posix",
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"poweroff",
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"powersave",
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"pstate",
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"pulumi",
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"pvresize",
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"radeon",
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@@ -136,6 +141,7 @@
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"runtimes",
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"sata",
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"schedulable",
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"schedutil",
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"scrollback",
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"setfacl",
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"setfattr",
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@@ -168,7 +174,6 @@
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"xkcd",
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"zstd"
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],
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"markdown.extension.toc.levels": "2..6",
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"markdown.extension.toc.orderedList": true
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}
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73
knowledge base/check or set the cpu frequency or governor.md
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73
knowledge base/check or set the cpu frequency or governor.md
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@@ -0,0 +1,73 @@
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# 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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@@ -1,17 +0,0 @@
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# Check or set the CPU frequency or governor
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```sh
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cat '/sys/devices/system/cpu/cpufreq/'*'/affected_cpus'
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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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# Enable a new governor.
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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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# Do not boost the CPU frequency for nice loads.
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echo 1 | sudo tee '/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load'
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```
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@@ -6,19 +6,29 @@ Default governor is _ondemand_ for older CPUs and kernels and _schedutil_ for ne
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```sh
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# Install.
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sudo apt install 'linux-cpupower'
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sudo dnf install 'kernel-tools'
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apt install 'linux-cpupower'
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dnf install 'kernel-tools'
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zypper install 'cpupower'
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# List the available governors.
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cpupower frequency-info --governors
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cpupower -c "3-6" frequency-info --governors
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cpupower --cpu "0-$(( $(nproc) - 1 ))" frequency-info --governors
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# Get the current active governor.
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cpupower frequency-info --policy
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cpupower -c '4' frequency-info --policy
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cpupower --cpu '4,5' frequency-info --policy
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# Set a new governor until reboot.
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# Set new governors until reboot.
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sudo cpupower frequency-set -g 'performance'
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sudo cpupower frequency-set --governor 'powersave'
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sudo cpupower frequency-set --governor 'schedutil'
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sudo cpupower -c '1' frequency-set --governor 'powersave'
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sudo cpupower --cpu '2,4,7' frequency-set --governor 'schedutil'
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# Get the current frequency of CPUs.
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cpupower frequency-info -f
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cpupower -c '4-7' frequency-info -fm
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cpupower --cpu '2,5' frequency-info --freq --human
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```
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## Further readings
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@@ -8,16 +8,16 @@
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## TL;DR
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```sh
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sudo cpupower frequency-set --governor ondemand
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echo 1 | sudo tee /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
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sudo cpupower frequency-set --governor 'ondemand'
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echo 1 | sudo tee '/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load'
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# set this on boot
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echo "w /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load - - - - 1" | sudo tee /etc/tmpfiles.d/ondemand-ignore-nice.conf
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echo "w /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load - - - - 1" | sudo tee '/etc/tmpfiles.d/ondemand-ignore-nice.conf'
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```
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## Further readings
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- [Cpufreq]
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- [`cpupower`][cpupower]
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- [Laptop overheating and battery duration reduction]
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<!--
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88
knowledge base/tlp.md
Normal file
88
knowledge base/tlp.md
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@@ -0,0 +1,88 @@
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# tlp
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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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Manual mode: changes to the power source will be ignored until the next reboot, or until the `tlp start` command is issued to resume automatic mode.
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Changes through commands are valid until next reboot.
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```sh
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# Install it.
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zypper install 'tlp' 'tlp-rdw'
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# Start the service.
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sudo tlp start
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sudo systemctl start 'tlp.service'
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# Show information about the system.
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sudo tlp-stat
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# Show information about the CPU only.
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# Includes the active scaling driver and available governors.
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sudo tlp-stat -p
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sudo tlp-stat --processor -v
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# Show information about the battery only.
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sudo tlp-stat -b
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sudo tlp-stat --battery
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# Show the service's status.
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tlp-stat -s
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tlp-stat --system
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# Show the active configuration.
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tlp-stat -c
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tlp-stat --config
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# Show differences between the defaults and the user configuration.
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# From version 1.4.
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tlp-stat --cdiff
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# Apply profiles.
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# Doing this enters manual mode.
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sudo tlp bat
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sudo tlp ac
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# Change battery charge thresholds.
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sudo tlp setcharge '70' '90' 'BAT0'
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# Restore battery charge thresholds.
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sudo tlp setcharge
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# Check, enable, or disable automatic, event based actions on radio devices.
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# Leverages the Radio Device Wizard.
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tlp-rdw
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tlp-rdw enable
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tlp-rdw disable
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```
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## Further readings
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- [Documentation]
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- [`cpupower`][cpupower]
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## Sources
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All the references in the [further readings] section, plus the following:
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- [Battery care vendor specifics]
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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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<!-- Upstream -->
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[battery care vendor specifics]: https://linrunner.de/tlp/settings/bc-vendors.html
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[documentation]: https://linrunner.de/tlp/index.html
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<!-- Others -->
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