2022-12-17

1 files changed, 7 insertions, 1 deletions

diff --git a/modules/nixfiles/common/kernel.nix b/modules/nixos/common/kernel.nix
index 2fdfeeb..2fc40f9 100644
--- a/modules/nixfiles/common/kernel.nix
+++ b/modules/nixos/common/kernel.nix
@@ -1,7 +1,10 @@
 {lib, ...}:
 with lib; {
   boot = {
-    # I don't use it even on laptops.
+    # I don't use it even on laptops. It's also /required/ to disable it for
+    # ZFS[1].
+    # [1]: https://github.com/openzfs/zfs/issues/260
+    # [1]: https://github.com/openzfs/zfs/issues/12842
     kernelParams = ["hibernate=no"];
 
     kernel.sysctl = {
@@ -30,4 +33,7 @@ with lib; {
       "vm.vfs_cache_pressure" = 50;
     };
   };
+
+  # https://docs.kernel.org/admin-guide/mm/ksm.html
+  hardware.ksm.enable = true;
 }