Bootloader configuration and HW tweaks

configuration.nix

@@ -0,0 +1,47 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # Kernel configuration
+  boot = {
+    kernelParams = [ "zfs.zfs_arc_max=536870912" ];
+    kernelModules = [ "i915" "acpi_call" ];
+    extraModulePackages = with config.boot.kernelPackages; [ acpi_call ];
+    supportedFilesystems = [ "zfs" ];
+  };
+
+  # Intel CPU tweaks
+  hardware.cpu.intel.updateMicrocode =
+      lib.mkDefault config.hardware.enableRedistributableFirmware;
+
+    hardware.opengl.extraPackages = with pkgs; [
+      vaapiIntel
+      vaapiVdpau
+      libvdpau-va-gl
+    ];
+
+  # Bootloader configuration
+  boot.loader = {
+    timeout = 2;
+    grub = {
+      efiSupport = true;
+      configurationLimit = 50;
+      copyKernels = true;
+    };
+  };
+
+  # Run Nix garbage collector, while avoiding compiling
+  nix = {
+    gc = {
+      automatic = true;
+      options = "--delete-older-than 14d";
+    };
+    extraOptions = ''
+      keep-outputs = true
+      gc-keep-outputs = true
+    '';
+  };
+
+  # Clean tmp directory on shutdown
+  boot.cleanTmpDir = true;
+
+}