From 798459c745024c9adc8b82ca1f632de9974903cd Mon Sep 17 00:00:00 2001
From: Maggie White <maggiewhite@google.com>
Date: Fri, 21 Jul 2017 15:01:14 -0700
Subject: [PATCH] UFS-specific runtime I/O tuning

Tested 1/2x, 1x, 2x, and 4x the current readahead buffer and noop and
cfq I/O schedulers for /dev/block/sda, which contains /data. The most
consistent performance boost was seen across all UFS vendors and storage
sizes using cfq and a readahead buffer of 1024.

Bug: 38000161
Test: Compared 1P app launch times using app-launcher for schedulers
(noop, cfq) and readahead buffer sizes (128,512,1024,2048)

Change-Id: Ifcc9145d6f7a77ba4b3844b7892291eb348d9e1c
---
 init-common.rc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init-common.rc b/init-common.rc
index 608b3d3..0e1dec7 100644
--- a/init-common.rc
+++ b/init-common.rc
@@ -10,7 +10,7 @@ on late-fs
 
 on property:sys.boot_completed=1
     # end boot time fs tune
-    write /sys/block/sda/queue/read_ahead_kb 512
+    write /sys/block/sda/queue/read_ahead_kb 1024
     write /sys/block/sda/queue/nr_requests 128
     write /sys/block/sda/queue/iostats 1
     write /sys/block/dm-0/queue/read_ahead_kb 512