nixpkgs/modules/tasks/cpu-freq.nix

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{ config, pkgs, ... }:
with pkgs.lib;
{
###### interface
options = {
powerManagement.cpuFreqGovernor = mkOption {
default = "";
example = "ondemand";
type = types.uniq types.string;
description = ''
Configure the governor used to regulate the frequence of the
available CPUs. By default, the kernel configures the governor
"userspace".
'';
};
};
###### implementation
config = mkIf (config.powerManagement.cpuFreqGovernor != "") {
environment.systemPackages = [ pkgs.cpufrequtils ];
jobs.cpufreq =
{ description = "Initialize CPU frequency governor";
after = [ "systemd-modules-load.service" ];
wantedBy = [ "multi-user.target" ];
path = [ pkgs.cpufrequtils ];
preStart = ''
for i in $(seq 0 $(($(nproc) - 1))); do
for gov in $(cpufreq-info -c $i -g); do
if [ "$gov" = ${config.powerManagement.cpuFreqGovernor} ]; then
echo "<6>setting governor on CPU $i to $gov"
cpufreq-set -c $i -g $gov
fi
done
done
'';
};
};
}