feat: nb performance tweaks

hosts/nb/configuration.nix

@@ -77,9 +77,17 @@ in {
 
   swapDevices = [ {
     device = "/nix/persist/swapfile";
-    size = 32 * 1024;  # Size is in megabytes
+    size = 32 * 1024;  # Size is in megabytes (for hibernation)
   } ];
 
+  # Memory tuning for 92GB RAM
+  boot.kernel.sysctl = {
+    "vm.swappiness" = 10;
+    "vm.dirty_ratio" = 10;
+    "vm.dirty_background_ratio" = 5;
+    "vm.vfs_cache_pressure" = 50;
+  };
+
   # nixos cross building qemu
   boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
   boot.supportedFilesystems = [ "ntfs" ];
@@ -100,18 +108,6 @@ in {
     General = { ControllerMode = "bredr"; };
   };
 
-  services.tlp = {
-    enable = true;
-    settings = {
-      CPU_SCALING_GOVERNOR_ON_AC = "performance";
-      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
-      CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
-      CPU_ENERGY_PERF_POLICY_ON_AC = "performance";
-      START_CHARGE_THRESH_BAT0 = 60;
-      STOP_CHARGE_THRESH_BAT0 = 80;
-    };
-  };
-
   environment.persistence."/nix/persist" = {
     hideMounts = true;
     directories = [
@@ -263,13 +259,16 @@ in {
   };
 
   nix = {
-    settings.auto-optimise-store = true;
-    settings.experimental-features = [ "nix-command" "flakes" ];
-    # autoOptimiseStore = true;
+    settings = {
+      auto-optimise-store = true;
+      experimental-features = [ "nix-command" "flakes" ];
+      max-jobs = 12;
+      cores = 2;
+    };
     gc = {
       automatic = true;
-      dates = "daily";
-      options = "--delete-older-than 30d";
+      dates = "weekly";
+      options = "--delete-older-than 14d";
     };
     # Free up to 1GiB whenever there is less than 100MiB left.
     extraOptions = ''

hosts/nb/hardware-configuration.nix

@@ -17,6 +17,15 @@
   boot.kernelModules = [ "amdgpu" ];
   boot.extraModulePackages = [ ];
 
+  # AMD Ryzen 7 7840U optimizations
+  boot.kernelParams = [
+    "amd_pstate=active"
+    "amdgpu.dcdebugmask=0x10"
+    "amdgpu.dc=1"
+    "snd_hda_intel.power_save=1"
+    "transparent_hugepage=madvise"
+  ];
+
   fileSystems."/" = {
     device = "none";
     fsType = "tmpfs";
@@ -38,9 +47,10 @@
     options = [
       "subvol=@"
       "ssd"
-      "compress=zstd:3"
+      "compress=zstd:1"
       "discard=async"
       "noatime"
+      "commit=120"
     ];
   };
 
@@ -51,9 +61,10 @@
     options = [
       "subvol=@nix-store"
       "ssd"
-      "compress=zstd:3"
+      "compress=zstd:1"
       "discard=async"
       "noatime"
+      "commit=120"
     ];
   };
 
@@ -64,9 +75,10 @@
     options = [
       "subvol=@nix-persist"
       "ssd"
-      "compress=zstd:3"
+      "compress=zstd:1"
       "discard=async"
       "noatime"
+      "commit=120"
     ];
   };
 
@@ -79,13 +91,11 @@
   networking.useDHCP = lib.mkDefault true;
   # networking.interfaces.wlp52s0.useDHCP = lib.mkDefault true;
 
-  powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
   hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
 
   hardware.graphics = {
     enable = true;
     extraPackages = with pkgs; [
-      amdvlk
       vaapiVdpau
       libvdpau-va-gl
       libva

hosts/nb/modules/desktop/default.nix

@@ -110,8 +110,6 @@ in {
 
   programs.light.enable = true;
 
-  hardware.graphics.extraPackages = [ pkgs.amdvlk ];
-
   hardware.bluetooth.enable = true;
   hardware.bluetooth.powerOnBoot = true;
   hardware.bluetooth.settings = {
@@ -123,8 +121,16 @@ in {
   services.tlp.settings = {
     CPU_SCALING_GOVERNOR_ON_AC = "performance";
     CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
-    CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
+
     CPU_ENERGY_PERF_POLICY_ON_AC = "performance";
+    CPU_ENERGY_PERF_POLICY_ON_BAT = "balance_power";
+
+    CPU_BOOST_ON_AC = 1;
+    CPU_BOOST_ON_BAT = 0;
+
+    RUNTIME_PM_ON_AC = "auto";
+    RUNTIME_PM_ON_BAT = "auto";
+
     START_CHARGE_THRESH_BAT0 = 60;
     STOP_CHARGE_THRESH_BAT0 = 80;
   };

hosts/nb/modules/ollama.nix

@@ -6,6 +6,7 @@
     host = "127.0.0.1";
     port = 11434;
     openFirewall = false;
+    acceleration = "rocm";
     loadModels = [
       "mxbai-embed-large"
     ];