3   systemd.services.nix-daemon.serviceConfig = {
 
   4     CPUSchedulingPolicy = lib.mkForce "batch";
 
   5     IOSchedulingClass = lib.mkForce "best-effort";
 
   6     # 0: high priority, 7: low priority
 
   7     IOSchedulingPriority = lib.mkForce 4;
 
  11   systemd.services.nix-gc.serviceConfig = {
 
  12     CPUSchedulingPolicy = "idle";
 
  13     IOSchedulingClass = "idle";
 
  14     IOSchedulingPriority = 7;
 
  18   systemd.sleep.extraConfig = ''