flake/nixos/profiles/opt-in/gaming.nix

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{
pkgs,
lib,
config,
...
}: {
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myFlake.hardware.accessories.xboxOneController.enable = lib.mkDefault true;
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programs.gamemode = {
enable = true;
settings.custom = {
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start = "${lib.getExe pkgs.libnotify} 'GameMode Activated' 'GameMode Activated! Enjoy enhanced performance. 🚀'";
end = "${lib.getExe pkgs.libnotify} 'GameMode Deactivated' 'GameMode Deactivated. Back to normal mode. '";
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};
};
# Integrate with NVIDIA Optimus offloading.
# https://github.com/FeralInteractive/gamemode#note-for-hybrid-gpu-users
# https://github.com/NixOS/nixpkgs/pull/273177
environment.sessionVariables = {
"GAMEMODERUNEXEC" = let
inherit (config.hardware.nvidia.prime) offload;
in
lib.mkIf
(builtins.elem "nvidia" config.services.xserver.videoDrivers || offload.enable || offload.enableOffloadCmd)
(lib.mkDefault "nvidia-offload");
};
### https://wiki.archlinux.org/title/Gaming#Improving_performance
systemd.tmpfiles.rules = [
# Path Mode UID GID Age Argument
#"w /proc/sys/vm/compaction_proactiveness - - - - 0"
"w /proc/sys/vm/min_free_kbytes - - - - 1048576"
"w /proc/sys/vm/swappiness - - - - 10"
"w /sys/kernel/mm/lru_gen/enabled - - - - 5"
"w /proc/sys/vm/zone_reclaim_mode - - - - 0"
#"w /sys/kernel/mm/transparent_hugepage/enabled - - - - never"
#"w /sys/kernel/mm/transparent_hugepage/shmem_enabled - - - - never"
#"w /sys/kernel/mm/transparent_hugepage/khugepaged/defrag - - - - 0"
"w /proc/sys/vm/page_lock_unfairness - - - - 1"
"w /proc/sys/kernel/sched_child_runs_first - - - - 0"
"w /proc/sys/kernel/sched_autogroup_enabled - - - - 1"
"w /proc/sys/kernel/sched_cfs_bandwidth_slice_us - - - - 500"
"w /sys/kernel/debug/sched/latency_ns - - - - 1000000"
"w /sys/kernel/debug/sched/migration_cost_ns - - - - 500000"
"w /sys/kernel/debug/sched/min_granularity_ns - - - - 500000"
"w /sys/kernel/debug/sched/wakeup_granularity_ns - - - - 0"
"w /sys/kernel/debug/sched/nr_migrate - - - - 8"
];
}