From 95b92c232ed83cf095a9d61cf77a44a674b189f8 Mon Sep 17 00:00:00 2001
From: Yan Lin <github@yanlincs.com>
Date: Sun, 7 Sep 2025 11:42:34 +0200
Subject: [PATCH] Add zfs cache config

---
 hosts/nixos/hs/system.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hosts/nixos/hs/system.nix b/hosts/nixos/hs/system.nix
index 1104c86..af3a545 100644
--- a/hosts/nixos/hs/system.nix
+++ b/hosts/nixos/hs/system.nix
@@ -26,6 +26,12 @@
   boot.zfs.forceImportRoot = false;
   boot.zfs.extraPools = [ "cache" ]; # Auto-import additional pools
 
+  # ZFS ARC memory configuration for 32GB system
+  boot.kernelParams = [
+    "zfs.zfs_arc_max=17179869184"  # 16GB max ARC size
+    "zfs.zfs_arc_min=2147483648"   # 2GB min ARC size
+  ];
+
   # XFS drive mounts
   fileSystems."/mnt/wd-12t-1" = {
     device = "/dev/disk/by-id/ata-HGST_HUH721212ALE604_5PK2N4GB-part1";