3   systemd.sleep.extraConfig = ''
 
   8   systemd.services.nix-daemon.serviceConfig = {
 
   9     CPUSchedulingPolicy = lib.mkForce "batch";
 
  10     IOSchedulingClass = lib.mkForce "best-effort";
 
  11     # 0: high priority, 7: low priority
 
  12     IOSchedulingPriority = lib.mkForce 4;
 
  15   systemd.services.nix-gc.serviceConfig = {
 
  16     CPUSchedulingPolicy = "batch";
 
  17     IOSchedulingClass = "best-effort";
 
  18     IOSchedulingPriority = 7;