From cf47eebfaaba64cd2e0957402354fcd2efd214ab Mon Sep 17 00:00:00 2001
From: Daniel Langbein <daniel@systemli.org>
Date: Sat, 23 Sep 2023 22:30:13 +0200
Subject: [PATCH] BTRFS mount options

---
 modules/base.nix | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/modules/base.nix b/modules/base.nix
index cf7c075..153ea2e 100644
--- a/modules/base.nix
+++ b/modules/base.nix
@@ -75,12 +75,18 @@
     MaxFileSec=7day
   '';
 
-  # BTRFS compression.
+  # BTRFS mount options.
+  #
+  # Compression
+  #   `nixos-generate-config` does not detect mount options, so we add them here.
+  #   https://nixos.wiki/wiki/Btrfs#Compression
+  #
+  # noatime
+  #  Under read intensive work-loads, specifying noatime significantly improves performance because no new access time information needs to be written.
+  #  https://man.archlinux.org/man/btrfs.5#NOTES_ON_GENERIC_MOUNT_OPTIONS
   #
-  # `nixos-generate-config` does not detect mount options, so we add them here.
-  # https://nixos.wiki/wiki/Btrfs#Compression
   fileSystems = {
-    "/".options = [ "compress=zstd" ];
+    "/".options = [ "compress=zstd" "noatime" ];
   };
 
   # BTRFS scrub.