diff --git a/spec/eientei/default.nix b/spec/eientei/default.nix
index a5d67f3f..f864e146 100644
--- a/spec/eientei/default.nix
+++ b/spec/eientei/default.nix
@@ -27,6 +27,7 @@
     SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="80:61:5f:07:9e:2f", NAME="ix0"
     SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:e0:4c:68:bb:30", NAME="ss0"
   '';
+  boot.kernelParams = [ "zfs.zfs_arc_max=17179869184" ];
 
   imports = lib.pipe ./. [
     builtins.readDir