90 lines
2.6 KiB
Nix
90 lines
2.6 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.buildingIso) {
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nix.settings.system-features = lib.mkForce [
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"gccarch-znver4"
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"gccarch-skylake"
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# "gccarch-alderlake" missing WAITPKG
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"gccarch-x86-64-v3"
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"gccarch-x86-64-v4"
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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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# Keep ALL dependencies so we can rebuild offline. This DRASTICALLY increase disk usage, but disk space is cheap.
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# system.includeBuildDependencies = true;
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# nixpkgs.hostPlatform = {
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# gcc.arch = "znver4";
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# gcc.tune = "znver4";
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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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final: prev:
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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_znver4 =
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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 prev.linux_6_13 [
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"-march=znver4"
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"-mtune=znver4"
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]
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);
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# gsl = prev.gsl.overrideAttrs (old: {
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# # gsl tests fails when optimizations are enabled.
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# # > FAIL: cholesky_invert unscaled hilbert ( 4, 4)[0,2]: 2.55795384873636067e-13 0
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# # > (2.55795384873636067e-13 observed vs 0 expected) [28259614]
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# doCheck = false;
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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_znver4;
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})
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(lib.mkIf (config.me.buildingIso) {
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boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_6_13;
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boot.supportedFilesystems.zfs = true;
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})
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];
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}
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