Simon Gardling
a5c7c91e38
All checks were successful
Build and Deploy / deploy (push) Successful in 1m42s
BROKE intel arc A380 completely because it was forced into L1.1/L1.2 pcie substates. Forcewaking the device would fail and it would never come up. So I will be more conservative on power saving tuning.
42 lines
1.2 KiB
Nix
42 lines
1.2 KiB
Nix
{
|
|
...
|
|
}:
|
|
{
|
|
powerManagement = {
|
|
enable = true;
|
|
cpuFreqGovernor = "powersave";
|
|
};
|
|
|
|
# Always-on server: disable all sleep targets.
|
|
systemd.targets = {
|
|
sleep.enable = false;
|
|
suspend.enable = false;
|
|
hibernate.enable = false;
|
|
hybrid-sleep.enable = false;
|
|
};
|
|
|
|
boot.kernelParams = [
|
|
# Disable NMI watchdog at boot. Eliminates periodic perf-counter interrupts
|
|
# across all cores (~1 W). Safe: apcupsd provides hardware hang detection
|
|
# via UPS, and softlockup watchdog remains active.
|
|
"nmi_watchdog=0"
|
|
|
|
# Route kernel work items to already-busy CPUs rather than waking idle ones.
|
|
# Reduces C-state exit frequency at the cost of slightly higher latency on
|
|
# work items -- irrelevant for a server whose latency-sensitive paths are
|
|
# all in userspace (caddy, jellyfin).
|
|
"workqueue.power_efficient=1"
|
|
];
|
|
|
|
boot.kernel.sysctl = {
|
|
# Belt-and-suspenders: also set via boot param, but sysctl ensures it
|
|
# stays off if anything re-enables it at runtime.
|
|
"kernel.nmi_watchdog" = 0;
|
|
};
|
|
|
|
# Server has no audio consumers. Power-gate the HDA codec at module load.
|
|
boot.extraModprobeConfig = ''
|
|
options snd_hda_intel power_save=1 power_save_controller=Y
|
|
'';
|
|
}
|