anchor.diff:        interval = "weekly";
       };
   
  -    # Decrease journal size
  +    # Decrease journal size.
       journald.extraConfig = ''
         SystemMaxUse=500M
       '';
  
positive.code:     LC_COLLATE = "C"; # Use C style string sort.
    };
  
  
    # Increase file handler limit.
    security.pam.loginLimits = [{
      domain = "*";
  
negative.code:       ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"
      '';
    };
  
    # Enable zram to have better memory management.
    zramSwap = {
      enable = true;
      algorithm = "zstd";
    };
  }
  