wip: Implement nyx overlay

hosts/micronix/system.nix

@@ -0,0 +1,202 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+{
+  config,
+  pkgs,
+  libs,
+  ...
+}: {
+  boot.initrd.systemd = {
+    enable = true;
+    tpm2 = {enable = true;};
+    dbus = {enable = true;};
+  };
+
+  boot.kernelPackages = pkgs.linuxPackages_cachyos;
+
+  boot.kernelParams = [
+    "default_hugepagesz=1G"
+    "hugepagesz=1G"
+  ];
+
+  boot.kernel.sysctl = {
+    "vm.nr_hugepages" = 512;
+    "vm.swappiness" = 200;
+    "net.core.netdev_max_backlog" = 32768;
+    "net.core.somaxconn" = 16384;
+    "net.core.rmem_default" = 1048576;
+    "net.core.rmem_max" = 16777216;
+    "net.core.wmem_default" = 1048576;
+    "net.core.wmem_max" = 16777216;
+    "net.core.optmem_max" = 65536;
+    "net.ipv4.tcp_rmem" = "4096 1048576 2097152";
+    "net.ipv4.tcp_wmem" = "4096 65536 16777216";
+    "net.ipv4.udp_rmem_min" = 8192;
+    "net.ipv4.udp_wmem_min" = 8192;
+    "net.ipv4.tcp_fastopen" = 3;
+    "net.core.default_qdisc" = "cake";
+    "net.ipv4.tcp_congestion_control" = "bbr";
+    "vm.dirty_ratio" = 20;
+    "vm.dirty_background_ratio" = 10;
+    "vm.vfs_cache_pressure" = 25;
+    "vm.hugetlb_optimize_vmemmap" = 1;
+  };
+
+  services.scx = {
+    enable = true;
+    scheduler = "scx_lavd";
+    extraArgs = ["--performance"];
+  };
+
+  boot.runSize = "100%";
+  boot.devSize = "100%";
+  boot.devShmSize = "100%";
+  boot.tmp.useTmpfs = true;
+  boot.tmp.tmpfsSize = "100%";
+  boot.tmp.cleanOnBoot = true;
+
+  fileSystems."/" = {
+    fsType = "btrfs";
+    options = ["compress=zstd:6" "discard" "flushoncommit" "subvol=@"];
+  };
+
+  services.btrfs.autoScrub = {
+    fileSystems = ["/"]; # Assuming root is formatted with Btrfs.
+    interval = "daily";
+    enable = true;
+  };
+
+  zramSwap = {
+    enable = true;
+    priority = 100;
+    memoryPercent = 100;
+  };
+
+  nix.gc = {
+    automatic = true;
+    options = "-d";
+  };
+
+  nix.optimise.automatic = true;
+
+  nix.settings = {
+    experimental-features = "cgroups dynamic-derivations flakes nix-command recursive-nix";
+    auto-optimise-store = true;
+    http-connections = 0;
+    download-buffer-size = 671088640;
+    max-jobs = "auto";
+    sync-before-registering = true;
+    use-cgroups = true;
+  };
+
+  boot.initrd.kernelModules = ["amdgpu"];
+
+  # Processor settings for AMD
+  hardware.cpu.amd = {
+    sev.enable = true;
+    updateMicrocode = true;
+  };
+
+  # Bootloader.
+  boot.loader.systemd-boot = {
+    enable = true;
+    edk2-uefi-shell = {enable = true;};
+    memtest86 = {enable = true;};
+    configurationLimit = 3;
+  };
+
+  boot.plymouth = {
+    enable = true;
+  };
+
+  networking.tempAddresses = "default";
+
+  # Load AMD GPU drivers early
+  hardware.amdgpu.initrd = {
+    enable = true;
+  };
+
+  hardware.amdgpu.opencl = {
+    enable = true;
+  };
+
+  # Graphics
+  hardware.graphics = {
+    enable = true;
+    enable32Bit = true;
+  };
+
+  # Enable the X11 windowing system.
+  services.xserver.enable = true;
+  services.xserver.videoDrivers = ["amdgpu"];
+  services.xserver.updateDbusEnvironment = true;
+  services.xserver.enableTearFree = true;
+
+  qt = {
+    platformTheme = "kde";
+  };
+
+  # TLP
+  services.power-profiles-daemon.enable = false; # We disable this because it sucks
+  services.tlp.enable = true;
+  services.tlp.settings = {
+    CPU_DRIVER_OPMODE_ON_AC = "active";
+    CPU_DRIVER_OPMODE_ON_BAT = "active";
+    CPU_SCALING_GOVERNOR_ON_AC = "performance";
+    CPU_SCALING_GOVERNOR_ON_BAT = "schedutil";
+    CPU_BOOST_ON_AC = 1;
+    CPU_BOOST_ON_BAT = 0;
+    PLATFORM_PROFILE_ON_AC = "performance";
+    PLATFORM_PROFILE_ON_BAT = "low-power";
+    DISK_IOSCHED = "kyber";
+    RADEON_DPM_PERF_LEVEL_ON_AC = "high";
+    WIFI_PWR_ON_AC = "off";
+    WIFI_PWR_ON_BAT = "off";
+  };
+
+  # Enable sound with pipewire.
+  hardware.pulseaudio.enable = false;
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    jack.enable = true;
+  };
+
+  services.displayManager.sddm.enable = true;
+  services.desktopManager.plasma6.enable = true;
+  services.displayManager.defaultSession = "plasma";
+  services.displayManager.sddm.wayland.enable = true;
+
+  programs.dconf.enable = true;
+
+  xdg.portal.enable = true;
+  xdg.portal.xdgOpenUsePortal = true;
+
+  environment.plasma6.excludePackages = with pkgs.kdePackages; [
+    konsole
+    oxygen
+    libqaccessibilityclient
+  ];
+ 
+  services.dbus = {
+    implementation = "broker";
+  };
+
+  # SECURITY
+  security = {
+    tpm2 = {
+      enable = true;
+    }; # Having TPM2 is nice.
+    polkit = {
+      enable = true;
+    };
+    protectKernelImage = true;
+    forcePageTableIsolation = true;
+  };
+
+  systemd.tpm2.enable = true;
+}