nixcfg/hwModules/common/gaming/default.nix

{lib, ...}: {
  boot.kernel.sysctl = {
    # Improved file monitoring
    "fs.inotify.max_user_instances" = lib.mkOverride 100 8192; # Re-use the default from Bazzite even though the default NixOS value is higher.
    # "fs.inotify.max_user_watches" = lib.mkOverride 100 524288;

    # Disable watchdogs for maximum performance at the cost of resiliency
    "kernel.nmi_watchdog" = lib.mkOverride 100 0;
    "kernel.soft_watchdog" = lib.mkDefault 0;
    # "kernel.split_lock_mitigate" = lib.mkOverride 100 0;
    "kernel.watchdog" = lib.mkDefault 0;

    "kernel.sched_cfs_bandwidth_slice_u" = lib.mkDefault 3000;
    "kernel.sched_latency_ns" = lib.mkDefault 3000000;
    "kernel.sched_min_granularity_ns" = lib.mkDefault 300000;
    "kernel.sched_wakeup_granularity_ns" = lib.mkDefault 500000;
    "kernel.sched_migration_cost_ns" = lib.mkDefault 50000;
    "kernel.sched_nr_migrate" = lib.mkDefault 128;
    "kernel.split_lock_mitigate" = lib.mkDefault 0;

    # Network optimizations
    "net.core.default_qdisc" = lib.mkDefault "fq";
    "net.ipv4.tcp_congestion_control" = lib.mkDefault "bbr";
    "net.ipv4.tcp_fin_timeout" = lib.mkDefault 5;
    "net.ipv4.tcp_mtu_probing" = lib.mkForce 1;

    # Memory management
    "vm.dirty_background_bytes" = lib.mkDefault 134217728;
    "vm.dirty_bytes" = lib.mkDefault 268435456;
    # "vm.max_map_count" = lib.mkOverride 100 2147483642;
    "vm.page-cluster" = lib.mkDefault 0;
    "vm.swappiness" = lib.mkDefault 180;
    "vm.watermark_boost_factor" = lib.mkDefault 0;
    "vm.watermark_scale_factor" = lib.mkDefault 125;
  };

  services = {
    earlyoom = {
      enable = lib.mkDefault true;
      extraArgs = lib.mkDefault ["-M" "409600,307200" "-S" "409600,307200"];
    };

    udev.extraRules = ''
      # Significantly improved I/O performance
      ## SSD
      ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="kyber"

      ## NVME
      ACTION=="add|change", KERNEL=="nvme[0-9]n[0-9]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="kyber"

      ## MicroSD
      ACTION=="add|change", KERNEL=="mmcblk[0-9]p[0-9]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="bfq"

      ## HDD
      ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"
    '';
  };

  zramSwap = {
    algorithm = lib.mkDefault "lz4";
    priority = lib.mkDefault 100;
  };
}