From 19ceda95a806b289d0ea045e22aca7a05878792f Mon Sep 17 00:00:00 2001
From: Donovan Glover <donovan@dglover.co>
Date: Sat, 3 Aug 2024 12:46:41 -0400
Subject: [PATCH] phone: Limit dirty_ratio / dirty_background_ratio

Been running this for a few days now and it seems to make the phone
significantly slower under load but reduces the probability of hanging
and crashing by quite a bit.

Plan to try this later with maximum CPU frequency to see if high CPU
frequency still crashes the PinePhone.
---
 hosts/phone/configuration.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hosts/phone/configuration.nix b/hosts/phone/configuration.nix
index 8d806c4c..268d4294 100644
--- a/hosts/phone/configuration.nix
+++ b/hosts/phone/configuration.nix
@@ -193,6 +193,11 @@ in
 
     binfmt.emulatedSystems = mkForce [ ];
     loader.systemd-boot.enable = mkIf (pkgs.system == "aarch64-linux") (mkForce false);
+
+    kernel.sysctl = {
+      "vm.dirty_background_ratio" = 5;
+      "vm.dirty_ratio" = 10;
+    };
   };
 
   documentation.man.generateCaches = false;