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32 lines
1.2 KiB
Nix
32 lines
1.2 KiB
Nix
{
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pkgs,
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pkgs-small,
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...
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}:
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{
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# The NPU serves ./asr; the driver's compiler lookup is fixed by
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# NixOS/nixpkgs#570230, which reached nixos-unstable-small first (WA-037).
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hardware.cpu.intel.npu.enable = true;
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nixpkgs.overlays = [ (_: _: { inherit (pkgs-small) intel-npu-driver; }) ];
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# Ad-hoc CPU idle-power diagnostics: package power, C-state residency and
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# wakeup attribution. Long-term RAPL export lives in the shared
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# modules/nixos/base/power-monitoring.nix module.
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environment.systemPackages = [
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pkgs.linuxPackages_latest.cpupower
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pkgs.linuxPackages_latest.turbostat
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pkgs.powertop
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];
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# `powerManagement.cpuFreqGovernor = "powersave"` on x86 only selects the
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# cpufreq governor. Intel P-state has a second knob, EPP, which biases the
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# hardware between performance and power before the governor acts. Keep the
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# existing powersave governor, but use the power-oriented EPP for this host.
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#
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# `boot.kernel.sysfs` is NixOS's native, declarative interface for sysfs
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# attributes. It waits for the cpufreq attribute and writes it idempotently,
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# so no private cpupower systemd service is needed.
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boot.kernel.sysfs.devices.system.cpu."cpu[0-9]*".cpufreq.energy_performance_preference =
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"balance_power";
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}
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