From 9c5f3721575e63b0e83d77679ac8a1b7d056ee8f Mon Sep 17 00:00:00 2001
From: Peter Rice <peterrice@fastmail.com>
Date: Tue, 24 Mar 2026 21:26:48 -0400
Subject: [PATCH] zram -> zswap

---
 modules/nixos/nixos.nix | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/modules/nixos/nixos.nix b/modules/nixos/nixos.nix
index 676cb36..612d9f7 100644
--- a/modules/nixos/nixos.nix
+++ b/modules/nixos/nixos.nix
@@ -29,17 +29,12 @@
       systemd.oomd.enableRootSlice = true;
       systemd.oomd.enableUserSlices = true;
 
-      zramSwap = {
-        enable = true;
-        algorithm = "zstd";
-      };
-      # https://wiki.archlinux.org/title/Zram#Optimizing_swap_on_zram
-      boot.kernel.sysctl = {
-        "vm.swappiness" = 180;
-        "vm.watermark_boost_factor" = 0;
-        "vm.watermark_scale_factor" = 125;
-        "vm.page-cluster" = 0;
-      };
+      boot.kernelParams = [
+        "zswap.enabled=1"
+        "zswap.compressor=lz4"
+        "zswap.max_pool_percent=20"
+        "zswap.shrinker_enabled=1"
+      ];
 
       # override srvos, needed by btrbk only
       security.sudo.execWheelOnly = lib.mkForce false;
-- 
2.51.2