satr14/nix-flake
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set to perf overclock
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Satria 2026-05-14 09:08:05 +07:00
commit d97d291c98
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modules/system/homelab/mc.nix
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@ -12,7 +12,7 @@ in {
imports = [ inputs.mc.nixosModules.minecraft-servers ]; imports = [ inputs.mc.nixosModules.minecraft-servers ];
nixpkgs.overlays = [ inputs.mc.overlay ]; nixpkgs.overlays = [ inputs.mc.overlay ];
powerManagement.cpuFreqGovernor = "schedutil"; powerManagement.cpuFreqGovernor = "performance";
boot.kernel.sysctl = { boot.kernel.sysctl = {
"vm.nr_hugepages" = (ram-allocation-mb / 2) + 512; # (heap_mb / 2MB per page) + 512 pages (1GB) for ZGC off-heap overhead "vm.nr_hugepages" = (ram-allocation-mb / 2) + 512; # (heap_mb / 2MB per page) + 512 pages (1GB) for ZGC off-heap overhead
"vm.swappiness" = 10; "vm.swappiness" = 10;
@ -83,6 +83,8 @@ in {
# "-XX:+PerfDisableSharedMem" # Disables constant /tmp writes for JVM metrics # "-XX:+PerfDisableSharedMem" # Disables constant /tmp writes for JVM metrics
"-XX:ZAllocationSpikeTolerance=5" # Helps when server is active with many players (causes unnecessary GC load at idle) "-XX:ZAllocationSpikeTolerance=5" # Helps when server is active with many players (causes unnecessary GC load at idle)
"-XX:SoftMaxHeapSize=${toString (ram-allocation-mb - 2048)}M" # Leave 2GB headroom for off-heap memory (native code, mods, and ZGC overhead) "-XX:SoftMaxHeapSize=${toString (ram-allocation-mb - 2048)}M" # Leave 2GB headroom for off-heap memory (native code, mods, and ZGC overhead)
"-XX:ZCollectionInterval=1" # Force a GC cycle at minimum every 1s — prevents allocation stalls when ZGC falls behind Minecraft's bursty allocation
"-XX:ConcGCThreads=4" # Threads ZGC uses for concurrent work; default (cpu/8+1) is often just 2, too slow to keep up with allocation rate
]; in lib.concatStringsSep " " flags; ]; in lib.concatStringsSep " " flags;
}; };
}; };