anchor.diff:        enable = true;
         interval = "weekly";
       };
  +
  +    # Enable irqbalance service.
  +    irqbalance.enable = true;
   
       # Enable Plex Media Server.
       plex = {
  
positive.code: { pkgs, config, ... }:
  
  {
    nixpkgs.config.allowUnfree = true;
  
    # Early load i195 for better resolution in init.
    boot.initrd.kernelModules = [ "i915" ];
  
    # Do not load NVIDIA drivers.
    boot.blacklistedKernelModules = [ "nvidia" "nouveau" ];
  
    # Load VFIO related modules.
    boot.kernelModules = [ "vfio_virqfd" "vfio_pci" "vfio_iommu_type1" "vfio" ];
    boot.extraModprobeConfig = "options vfio-pci ids=10de:1c02,10de:10f1";
  
    # Enable IOMMU
    boot.kernelParams = [
      "intel_iommu=on"
    ];
  
    # Enable libvirtd.
    virtualisation = {
  
negative.code:   # Some misc packages.
    environment.systemPackages = with pkgs; [
      btrfs-progs
      cpuset
      hdparm
      rtorrent
      samba
  