105 lines
3 KiB
Nix
105 lines
3 KiB
Nix
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# yoinked from https://gitlab.com/funaali/dotfiles/-/blob/3c74966cc4501c548aac0ee83cf5982510dd615c/modules/nixos/custom-opts.nix#L50, thanks!
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{
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lib,
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config,
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pkgs,
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...
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}:
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with lib;
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with lib.custom; let
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cfg = config.hardware.march;
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in {
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options.hardware.march = with types; {
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arch = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "GCC -march=";
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};
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system = mkOption {
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type = types.str;
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default = "x86_64-linux";
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};
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enableNativeOptimizations = mkOption {
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type = types.bool;
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default = false;
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description = "Enable -march=<arch> optimizations for all packages";
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};
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enableNativeOptimizationsByDefault = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Architectures for which native optimizations are enabled by default.
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'';
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};
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TCPBBRCongestionControl = mkEnableOption "TCP BBR congestion control";
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cpu.vcores = mkOption {
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type = types.int;
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default = 0;
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description = "Teh number of virtual CPU cores. Used to calculate heuristics.";
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};
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memory.total = mkOption {
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type = types.int;
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default = 0;
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description = "Total amount of RAM in the system (gigabytes). Used to calculate heuristics.";
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};
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};
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config = mkMerge [
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# Enable nix to build for the system arch and its inferiors.
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(mkIf (cfg.arch != null) {
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# taken from https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/config/nix.nix
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nix.settings.system-features = map (x: "gccarch-${x}") ((systems.architectures.inferiors.${cfg.arch} or []) ++ [cfg.arch]) ++ ["big-parallel"];
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})
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# Set nix cores and max jobs based on cores and installed memory.
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(mkIf (cfg.cpu.vcores + cfg.memory.total > 0) (
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let
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minMemoryPerCore = 2;
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jobsOvercommitFactor = 4;
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cores = min 16 (min (cfg.cpu.vcores / 2) (cfg.memory.total / minMemoryPerCore));
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max-jobs = jobsOvercommitFactor * cfg.memory.total / (cores * minMemoryPerCore);
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in {
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nix.settings = {
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inherit cores max-jobs;
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};
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}
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))
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# Native arch optimizations
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(mkIf (cfg.enableNativeOptimizations || elem cfg.arch cfg.enableNativeOptimizationsByDefault) {
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assertions = [
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{
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message = "custom.arch can't be null when custom.enableNativeOptimizations is true!";
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assertion = cfg.enableNativeOptimizations -> cfg.arch != null;
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}
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];
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nixpkgs.hostPlatform = mkOverride 1 {
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system = cfg.system;
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gcc.arch = cfg.arch;
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gcc.tune = cfg.arch;
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};
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})
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# Enable TCP BBR congestion control
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(mkIf cfg.TCPBBRCongestionControl {
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boot.kernelModules = ["tcp_bbr"];
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boot.kernel.sysctl = {
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"net.core.default_qdisc" = "cake";
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"net.ipv4.tcp_congestion_control" = "bbr";
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};
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})
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# Settings if total memory is defined
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(mkIf (cfg.memory.total > 0) {
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services.earlyoom.freeMemThreshold = min 1 (max 5 (200 / cfg.memory.total));
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})
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];
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}
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