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docs: cpuFreqGovernor: explain which hardware this config affects

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Colin 2023-09-08 23:37:21 +00:00
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commit eab0d656d3
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hosts/common/hardware/default.nix
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@ -31,12 +31,18 @@
# powertop will default to putting USB devices -- including HID -- to sleep after TWO SECONDS
powerManagement.powertop.enable = false;
# linux CPU governor: <https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt>
# - "powersave" => force CPU to always run at lowest supported frequency
# - "performance" => force CPU to always run at highest frequency
# - "ondemand" => adjust frequency based on load
# - "conservative" (ondemand but slower to adjust)
# - "schedutil"
# - "userspace"
# - options:
# - "powersave" => force CPU to always run at lowest supported frequency
# - "performance" => force CPU to always run at highest frequency
# - "ondemand" => adjust frequency based on load
# - "conservative" (ondemand but slower to adjust)
# - "schedutil"
# - "userspace"
# - not all options are available for all platforms
# - intel (intel_pstate) appears to manage scaling w/o intervention/control from the OS.
# - AMD (acpi-cpufreq) appears to manage scaling via the OS *or* HW. but the ondemand defaults never put it to max hardware frequency.
# - qualcomm (cpufreq-dt) appears to manage scaling *only* via the OS. ondemand governor exercises the full range.
# - query details with `sudo cpupower frequency-info`
powerManagement.cpuFreqGovernor = "ondemand";
services.logind.extraConfig = ''