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nixos-generate-config: detect CPU governor
* cpu-freq: Try powersave if ondemand is not available
* Revert "cpu-freq: Try powersave if ondemand is not available"
This reverts commit 4dc56db37e
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Consult available scaling governors; for freshly generated configs, this provides a better experience than relying on a default that might not work everywhere.
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@ -69,7 +69,7 @@ in
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config = mkIf cfg.enable {
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# FIXME: Implement powersave governor for sandy bridge or later Intel CPUs
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# Leftover for old setups, should be set by nixos-generate-config now
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powerManagement.cpuFreqGovernor = mkDefault "ondemand";
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systemd.targets.post-resume = {
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@ -94,6 +94,21 @@ sub hasCPUFeature {
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my $cpus = scalar (grep {/^processor\s*:/} (split '\n', $cpuinfo));
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# Determine CPU governor to use
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if (-e "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors") {
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my $governors = read_file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors");
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# ondemand governor is not available on sandy bridge or later Intel CPUs
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my @desired_governors = ("ondemand", "powersave");
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my $e;
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foreach $e (@desired_governors) {
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if (index($governors, $e) != -1) {
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last if (push @attrs, "powerManagement.cpuFreqGovernor = \"$e\";");
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}
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}
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}
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# Virtualization support?
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push @kernelModules, "kvm-intel" if hasCPUFeature "vmx";
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push @kernelModules, "kvm-amd" if hasCPUFeature "svm";
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