From cebc08cb78156a4b6065f3855a4c89fd61d8adb8 Mon Sep 17 00:00:00 2001
From: Guanran Wang <guanran928@outlook.com>
Date: Fri, 22 Dec 2023 10:57:03 +0800
Subject: [PATCH] nixos: zram-generator: use optimized sysctl

---
 nixos/profiles/opt-in/zram-generator.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/nixos/profiles/opt-in/zram-generator.nix b/nixos/profiles/opt-in/zram-generator.nix
index 7cd02e6..47bde06 100644
--- a/nixos/profiles/opt-in/zram-generator.nix
+++ b/nixos/profiles/opt-in/zram-generator.nix
@@ -6,4 +6,12 @@ _: {
       zram-size = "ram";
     };
   };
+
+  # 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;
+  };
 }