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Configure kernel preemption.

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This commit is contained in:
Tom Alexander
2026-05-30 21:40:12 -04:00
parent 01fff9b60a
commit 794cce9a50
5 changed files with 212 additions and 54 deletions
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66
nix/kubernetes/roles/optimized_build/default.nix
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@@ -49,65 +49,29 @@
};
config = lib.mkMerge [
(lib.mkIf (!config.me.optimizations.enable) (
lib.mkMerge [
{
# boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_6_17;
boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux;
}
]
))
(lib.mkIf config.me.optimizations.enable (
lib.mkMerge [
{
boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_me;
nixpkgs.hostPlatform = {
gcc.arch = config.me.optimizations.arch;
gcc.tune = config.me.optimizations.arch;
};
nixpkgs.overlays = [
(
final: prev:
let
addConfig =
additionalConfig: pkg:
pkg.override (oldconfig: {
structuredExtraConfig = pkg.structuredExtraConfig // additionalConfig;
});
in
{
linux_me = addConfig {
# Full preemption
PREEMPT = lib.mkOverride 60 lib.kernel.yes;
PREEMPT_VOLUNTARY = lib.mkOverride 60 lib.kernel.no;
# Google's BBRv3 TCP congestion Control
TCP_CONG_BBR = lib.kernel.yes;
DEFAULT_BBR = lib.kernel.yes;
# Preemptive Full Tickless Kernel at 300Hz
HZ = lib.kernel.freeform "300";
HZ_300 = lib.kernel.yes;
HZ_1000 = lib.kernel.no;
} prev.linux; # or prev.linux_6_17
}
)
(final: prev: {
inherit (final.unoptimized)
assimp
binaryen
gsl
rapidjson
ffmpeg-headless
ffmpeg
pipewire
chromaprint
gtkmm
;
})
];
# nixpkgs.overlays = [
# (final: prev: {
# inherit (final.unoptimized)
# assimp
# binaryen
# gsl
# rapidjson
# ffmpeg-headless
# ffmpeg
# pipewire
# chromaprint
# gtkmm
# ;
# })
# ];
}
]
))