From 26e347f38ce422f7925e869a95ca15997e40ab04 Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Sun, 19 May 2024 10:39:17 +0000
Subject: [PATCH] moby: ship with way higher CMA by default

---
 hosts/by-name/moby/kernel.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hosts/by-name/moby/kernel.nix b/hosts/by-name/moby/kernel.nix
index d99fba69..1b776612 100644
--- a/hosts/by-name/moby/kernel.nix
+++ b/hosts/by-name/moby/kernel.nix
@@ -78,8 +78,12 @@ in
     #
     # the default CMA seems to be 32M.
     # i was running fine with 256MB from 2022/07-ish through 2022/12-ish, but then the phone quit reliably coming back from sleep (phosh): maybe a memory leak?
+    # bumped to 512M on 2023/01
+    # bumped to 1536M on 2024/05
     # `cat /proc/meminfo` to see CmaTotal/CmaFree if interested in tuning this.
-    "cma=512M"
+    # kernel param mentioned here: <https://cateee.net/lkddb/web-lkddb/CMA_SIZE_PERCENTAGE.html>
+    # i think cma mem isn't exclusive -- it can be used as ordinary `malloc`, still. i heard someone suggest the OS default should just be 50% memory to CMA.
+    "cma=1536M"
     # 2023/10/20: potential fix for the lima (GPU) timeout bugs:
     # - <https://gitlab.com/postmarketOS/pmaports/-/issues/805#note_890467824>
     "lima.sched_timeout_ms=2000"