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Move CPU optimizations into their own role.

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This is remove duplication between the individual hosts folders.
This commit is contained in:
Tom Alexander
2025-05-12 19:06:04 -04:00
parent 554a6aff65
commit 96a96a0bc4
12 changed files with 237 additions and 436 deletions
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17
nix/configuration/hosts/hydra/default.nix
View File

@@ -36,9 +36,24 @@
time.timeZone = "America/New_York";
i18n.defaultLocale = "en_US.UTF-8";
me.optimizations.enable = true;
me.secureBoot.enable = false;
me.optimizations = {
enable = true;
arch = "znver4";
system_features = [
"gccarch-znver4"
"gccarch-skylake"
# "gccarch-alderlake" missing WAITPKG
"gccarch-x86-64-v3"
"gccarch-x86-64-v4"
"benchmark"
"big-parallel"
"kvm"
"nixos-test"
];
};
# Mount tmpfs at /tmp
boot.tmp.useTmpfs = true;

73
nix/configuration/hosts/hydra/optimized_build.nix
View File

@@ -1,73 +0,0 @@
{
config,
lib,
pkgs,
...
}:
{
imports = [ ];
config = lib.mkMerge [
{
nix.settings.system-features = lib.mkForce [
"gccarch-znver4"
"gccarch-x86-64-v3"
"gccarch-x86-64-v4"
"benchmark"
"big-parallel"
# "kvm"
# "nixos-test"
];
nixpkgs.hostPlatform = {
gcc.arch = "znver4";
gcc.tune = "znver4";
system = "x86_64-linux";
};
nixpkgs.overlays = [
(
final: prev:
let
optimizeWithFlags =
pkg: flags:
pkg.overrideAttrs (old: {
NIX_CFLAGS_COMPILE = [ (old.NIX_CFLAGS_COMPILE or "") ] ++ flags;
});
addConfig =
additionalConfig: pkg:
pkg.override (oldconfig: {
structuredExtraConfig = pkg.structuredExtraConfig // additionalConfig;
});
in
{
linux_znver4 =
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;
}
(
optimizeWithFlags prev.linux_6_14 [
"-march=znver4"
"-mtune=znver4"
]
);
}
)
];
boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_znver4;
}
];
}