commit d6d8c1f81c63ae95f4bd794060c07558e53dfd67
author Daeho Jeong <daehojeong@google.com> Wed Jun 28 14:35:30 2023 -0700
committer Daeho Jeong <daehojeong@google.com> Wed Jun 28 14:35:30 2023 -0700
tree bbc35311527cb9a5ee6db269e3cdd39d8e9d58b7
parent de4ad68fa76867848fa76e44ec8cfd3db0239c31

init.rc: set f2fs seq_file_ra_mul to 128

Based on experiments, we fount out 128 (128 x global readahead window
size = 16mb) is the optimal multiple to boost up read speeds for the
sequentially accessed files with POSIX_FADV_SEQUENTIAL.

Bug: 195311558
Test: check the /sys/fs/f2fs/<userdata partition>/seq_file_ra_mul value
Change-Id: I7563ad6e47b9ab76ae7fe36978d0e5970a7490e8
Signed-off-by: Daeho Jeong <daehojeong@google.com>

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index 5344368..a8b78d5 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -1129,7 +1129,7 @@
     write /dev/sys/fs/by-name/userdata/iostat_enable 1
 
     # set readahead multiplier for POSIX_FADV_SEQUENTIAL files
-    write /dev/sys/fs/by-name/userdata/seq_file_ra_mul 16
+    write /dev/sys/fs/by-name/userdata/seq_file_ra_mul 128
 
     # limit discard size to 128MB in order to avoid long IO latency
     # for filesystem tuning first (dm or sda)