anchor.diff:      system.modulesTree = [ kernel ] ++ config.boot.extraModulePackages;
   
       boot.kernelParams =
  -      [ "splash=verbose" ] ++ 
  +      [ "splash=verbose"
  +        # Force the Completely Fair Scheduler to be used by default.
  +        "elevator=cfq"
  +      ] ++ 
         optional config.boot.vesa "vga=0x317";
         
       boot.kernelModules = [ "loop" ];
  
positive.code:     };
      
      boot.initrd.kernelModules = mkOption {
        default = [
        ];
        description = "List of modules that are always loaded by the initrd.";
      };
  
  
negative.code:     boot.initrd.kernelModules =
        [ # For LVM.
          "dm_mod"
          
          # For usual AT keyboards.
          "i8042"        
        ];
  
      # The Linux kernel >= 2.6.27 provides firmware.
  