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chore(linux/power-consumption): merge articles
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Michele Cereda
@@ -1,29 +1,115 @@
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# Lower the power consumption
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1. [TL;DR](#tldr)
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1. [Sources](#sources)
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1. [Disable unused services](#disable-unused-services)
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1. [Improve battery performance](#improve-battery-performance)
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1. [Tune power-related settings](#tune-power-related-settings)
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1. [Further readings](#further-readings)
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## TL;DR
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1. [Disable unused services].
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1. [Tune power-related settings].
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1. \[if using a battery] [Improve battery performance].
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1. Turn off the NMI watchdog hardlockup detector.\
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The NMI watchdog is a debugging feature to catch hardware hangs that cause a kernel panic. On some systems it can
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generate a lot of interrupts, causing a noticeable increase in power usage.
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1. Bump SATA Active Link Power Management to a higher setting.
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1. Increase the virtual memory dirty writeback time to help aggregating disk I/O.\
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This reduces spanned disk writes.
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```sh
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# Summarize performance of the last boot.
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sudo systemd-analyze
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# Show last boot performance.
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# Also shows the process tree.
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sudo systemd-analyze critical-chain
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# Check power stats.
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sudo powertop
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# Set all tunable options to their `GOOD` setting.
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# Calibration is interactive.
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sudo powertop --calibrate && sudo powertop --auto-tune
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# Turn off the NMI watchdog hardlockup detector.
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echo '0' > '/proc/sys/kernel/nmi_watchdog'
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# Bump SATA Active Link Power Management to a higher setting.
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echo 'med_power_with_dipm' > '/sys/class/scsi_host/host0/link_power_management_policy'
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# Increase the virtual memory dirty writeback time to help aggregating disk I/O
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# together. This reduces spanned disk writes.
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# Increase the virtual memory dirty writeback time to help aggregating disk I/O.
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# Value is in 1/100s of seconds. Default is 500 (5 seconds).
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echo 6000 > '/proc/sys/vm/dirty_writeback_centisecs'
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sudo sysctl vm.dirty_writeback_centisecs=6000
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```
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## Sources
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## Disable unused services
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- Arch Wiki's [power management][arch wiki power management] page
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```sh
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$ sudo systemd-analyze
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Startup finished in 13.129s (firmware) + 5.413s (loader) + 1.746s (kernel) + 7.903s (userspace) = 28.192s
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graphical.target reached after 1.239s in userspace
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$ sudo systemd-analyze critical-chain
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The time when unit became active or started is printed after the "@" character.
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The time the unit took to start is printed after the "+" character.
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graphical.target @1.239s
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└─multi-user.target @1.239s
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└─ModemManager.service @1.154s +84ms
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└─polkit.service @937ms +215ms
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└─basic.target @928ms
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└─sockets.target @928ms
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└─dbus.socket @928ms
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└─sysinit.target @924ms
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└─systemd-backlight@backlight:acpi_video0.service @2.273s +8ms
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└─system-systemd\x2dbacklight.slice @2.272s
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└─system.slice @197ms
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└─-.slice @197ms
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```
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## Improve battery performance
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```sh
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# Enable automatic power management.
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# See `tlpui` on GitHub for UI.
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sudo systemctl enable --now 'tlp.service'
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sudo vim '/etc/tlp.conf'
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# Check power stats.
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sudo 'powertop'
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```
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## Tune power-related settings
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```sh
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sudo powertop --calibrate
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sudo powertop --auto-tune
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```
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## Further readings
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- [PowerTOP]
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- [Laptop Mode Tools: Extend Your Laptop Battery Life]
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- [`laptop-mode-tools` article in the Arch Wiki][arch wiki laptop-mode-tools]
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- [Power management article in the Arch Wiki][arch wiki power management]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- In-article sections -->
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[Disable unused services]: #disable-unused-services
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[Tune power-related settings]: #tune-power-related-settings
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[Improve battery performance]: #improve-battery-performance
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<!-- Knowledge base -->
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[PowerTOP]: ../powertop.md
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<!-- Others -->
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[arch wiki power management]: https://wiki.archlinux.org/title/Power_management
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[Laptop Mode Tools: Extend Your Laptop Battery Life]: https://www.unixmen.com/laptop-mode-tools-extend-laptop-battery-life/
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[arch wiki laptop-mode-tools]: https://wiki.archlinux.org/title/Laptop_Mode_Tools
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[arch wiki power management]: https://wiki.archlinux.org/title/Power_management
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@@ -1,71 +0,0 @@
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# Optimize battery
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1. [TL;DR](#tldr)
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1. [Disable unused services](#disable-unused-services)
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1. [Improve battery performance](#improve-battery-performance)
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1. [Further readings](#further-readings)
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## TL;DR
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```sh
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# Summarize performance of the last boot.
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sudo systemd-analyze
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# Show last boot performance.
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# Also shows the process tree.
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sudo systemd-analyze critical-chain
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# Check power stats.
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sudo 'powertop'
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```
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## Disable unused services
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```sh
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$ sudo systemd-analyze
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Startup finished in 13.129s (firmware) + 5.413s (loader) + 1.746s (kernel) + 7.903s (userspace) = 28.192s
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graphical.target reached after 1.239s in userspace
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$ sudo systemd-analyze critical-chain
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The time when unit became active or started is printed after the "@" character.
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The time the unit took to start is printed after the "+" character.
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graphical.target @1.239s
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└─multi-user.target @1.239s
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└─ModemManager.service @1.154s +84ms
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└─polkit.service @937ms +215ms
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└─basic.target @928ms
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└─sockets.target @928ms
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└─dbus.socket @928ms
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└─sysinit.target @924ms
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└─systemd-backlight@backlight:acpi_video0.service @2.273s +8ms
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└─system-systemd\x2dbacklight.slice @2.272s
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└─system.slice @197ms
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└─-.slice @197ms
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```
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## Improve battery performance
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```sh
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# Enable automatic power management.
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# See `tlpui` on GitHub for UI.
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sudo systemctl enable --now 'tlp.service'
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sudo vim '/etc/tlp.conf'
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# Check power stats.
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sudo 'powertop'
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```
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## Further readings
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- [laptop-mode-tools]
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- [laptop-mode-tools in the Arch Wiki]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- Others -->
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[laptop-mode-tools]: https://www.unixmen.com/laptop-mode-tools-extend-laptop-battery-life/
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[laptop-mode-tools in the arch wiki]: https://wiki.archlinux.org/title/Laptop_Mode_Tools
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77
knowledge base/powertop.md
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77
knowledge base/powertop.md
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@@ -0,0 +1,77 @@
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# PowerTOP
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> TODO
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Linux tool used to diagnose issues with power consumption and power management.
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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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Has an interactive mode one can use to experiment with various power management settings.
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When running on battery, PowerTOP tracks power consumption and activity on the system.\
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Once there are sufficient measurements, it can start to report power estimates for various activities.
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Calibration entails cycling through various display brightness levels (including "off"), USB device activities, and
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other workloads.
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<details>
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<summary>Setup</summary>
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```sh
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zypper install 'powertop'
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```
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</details>
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<details>
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<summary>Usage</summary>
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```sh
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sudo powertop
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# Set all tunable options to their `GOOD` setting.
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sudo powertop --auto-tune
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# Help increasing the accuracy of the consumption measurements estimation.
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sudo powertop --calibrate
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```
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</details>
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<!-- Uncomment if used
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<details>
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<summary>Real world use cases</summary>
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```sh
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```
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</details>
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-->
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## Further readings
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- [Website]
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- [Codebase]
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### Sources
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- [Documentation]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- In-article sections -->
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<!-- Knowledge base -->
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<!-- Files -->
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<!-- Upstream -->
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[codebase]: https://github.com/fenrus75/powertop
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[documentation]: https://website/docs/
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[website]: http://www.01.org/powertop
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<!-- Others -->
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