81 lines
2.1 KiB
Nix
81 lines
2.1 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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{
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imports = [ ];
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config = lib.mkMerge [
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{ }
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(lib.mkIf (!config.me.optimizations.enable) {
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boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_6_13;
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})
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(lib.mkIf (config.me.optimizations.enable) {
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nixpkgs.hostPlatform = {
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gcc.arch = "alderlake";
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gcc.tune = "alderlake";
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system = "x86_64-linux";
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};
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nixpkgs.overlays = [
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(
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self: super:
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let
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optimizeWithFlags =
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pkg: flags:
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pkg.overrideAttrs (old: {
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NIX_CFLAGS_COMPILE = [ (old.NIX_CFLAGS_COMPILE or "") ] ++ flags;
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});
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addConfig =
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additionalConfig: pkg:
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pkg.override (oldconfig: {
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structuredExtraConfig = pkg.structuredExtraConfig // additionalConfig;
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});
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in
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{
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linux_me =
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addConfig
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{
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# Full preemption
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PREEMPT = lib.mkOverride 60 lib.kernel.yes;
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PREEMPT_VOLUNTARY = lib.mkOverride 60 lib.kernel.no;
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# Google's BBRv3 TCP congestion Control
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TCP_CONG_BBR = lib.kernel.yes;
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DEFAULT_BBR = lib.kernel.yes;
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# Preemptive Full Tickless Kernel at 300Hz
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HZ = lib.kernel.freeform "300";
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HZ_300 = lib.kernel.yes;
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HZ_1000 = lib.kernel.no;
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}
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(
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optimizeWithFlags super.linux_6_12 [
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"-march=alderlake"
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"-mtune=alderlake"
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]
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);
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}
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)
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];
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boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_me;
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})
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(lib.mkIf (!config.me.buildingIso) {
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nix.settings.system-features = lib.mkForce [
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"gccarch-alderlake"
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"gccarch-x86-64-v3"
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"benchmark"
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"big-parallel"
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"kvm"
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"nixos-test"
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];
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})
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(lib.mkIf (config.me.buildingIso) {
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boot.supportedFilesystems = [ "zfs" ];
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})
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];
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}
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