* If power management is enabled, set the governor to ‘ondemand’ by
default. See http://www.codon.org.uk/~mjg59/power/good_practices.html for the reasoning. (Basically, the ‘performance’ and ‘powersave’ governors don't actually provide extra performance or power savings in most cases.) It used to be that desktop environments like KDE were able to set the governor through HAL (e.g. KDE could be configured to switch to the powersave governor when the user unplugs his laptop). However, this is no longer the case with upower — it is now expected that everybody uses the ondemand governor. See http://old.nabble.com/-PATCH--powerdevil-remove-cpufreq.patch-td27815354.html * Rename ‘cpuFreqGovernor’ to ‘powerManagement.cpuFreqGovernor’. * Include cpufreq-utils in the system path if a governor is set, since we depend on it anyway. svn path=/nixos/trunk/; revision=30991
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@ -91,6 +91,8 @@ in
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"p4_clockmod"
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];
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powerManagement.cpuFreqGovernor = "ondemand";
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};
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}
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@ -6,7 +6,8 @@ with pkgs.lib;
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###### interface
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options = {
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cpuFreqGovernor = mkOption {
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powerManagement.cpuFreqGovernor = mkOption {
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default = "";
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example = "ondemand";
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description = ''
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@ -15,13 +16,17 @@ with pkgs.lib;
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"userspace".
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'';
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};
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};
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###### implementation
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config = mkIf (config.cpuFreqGovernor != "") ({
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jobs.cpuFreq =
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config = mkIf (config.powerManagement.cpuFreqGovernor != "") {
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environment.systemPackages = [ pkgs.cpufrequtils ];
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jobs.cpufreq =
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{ description = "Initialize CPU frequency governor";
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startOn = "started udev";
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@ -30,10 +35,11 @@ with pkgs.lib;
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script = ''
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for i in $(seq 0 $(($(nproc) - 1))); do
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${pkgs.cpufrequtils}/bin/cpufreq-set -g ${config.cpuFreqGovernor} -c $i
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${pkgs.cpufrequtils}/bin/cpufreq-set -g ${config.powerManagement.cpuFreqGovernor} -c $i
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done
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'';
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};
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});
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};
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}
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