Enable-macOS-Server-Performance-Mode.md

Enable macOS Server Performance Mode

Performance mode changes the system parameters of your Mac. These changes take better advantage of your hardware for demanding server applications.

A Mac with macOS Server that needs to run high-performance services can turn on performance mode to dedicate additional system resources for server applications. Note, however, that performance mode can be enabled even without macOS Server being installed to achieve similar benifits for other high-performance services.

sudo nvram boot-args="serverperfmode=1 $(nvram boot-args 2>/dev/null | cut -f 2-)"
sudo reboot

Reference: https://support.apple.com/en-us/HT202528.

Changes to sysctl -a output before/after enabling

Changes shown in parameter: before -> after format. The full diff output of sysctl has been cleaned up a quite a bit to exclude things that are obviously not tuning params (like uptime and counters or stats, for example)

kern.maxvnodes: 263168 -> 300000
kern.maxproc: 2128 -> 5000
kern.maxprocperuid: 1418 -> 3750
kern.ipc.somaxconn: 128 -> 1024
kern.ipc.nmbclusters: 65536 -> 98304
kern.ipc.njcl: 21840 -> 32768
kern.bootargs:  -> serverperfmode=1 
kern.timer.longterm.threshold: 1000 -> 0
kern.timer.longterm.qlen: 155 -> 0
kern.timer.longterm.scan_pauses: 282 -> 0
kern.progressmeter: 685 -> 674
net.inet.ip.rtexpire: 10 -> 3600
net.inet.ip.maxfragpackets: 2048 -> 3072
net.inet.tcp.fastopen_backlog: 10 -> 200
net.inet.tcp.tcbhashsize: 4096 -> 8192
net.inet6.ip6.maxfragpackets: 2048 -> 3072
net.inet6.ip6.maxfrags: 4096 -> 6144
ktrace.background_pid: 80154 -> 0
ktrace.configured_by: tailspind -> 

Thanks!
For some reason the boot-args change command did not work for me but I could turn it on with 4 reboots like:

1. rebooted in recovery mode with command (windows) + r, then Utillities / Terminal
   csrutil disable
2. rebooted in normal mode, brought up the terminal and enabled perfmode like:
   sudo serverinfo --setperfmode 1
3. rebooted in recovery mode and turned back on system integrity protection from the terminal:
   csrutil enable
4. rebooted into normal mode and tested with these commands (both should be enabled):
   serverinfo --perfmode; csrutil status