From 270f0d46efd21ae23cc42f26d6ea541e94995b2a Mon Sep 17 00:00:00 2001
From: Jack Yu <jackyu@google.com>
Date: Wed, 12 Jan 2022 15:21:28 -0800
Subject: [PATCH] Added default TCP buffer size for Pixels

Bug: 213596972
Test: Manual
Change-Id: Ib2dbd339d9b8ae9f9f1248f7be518cdf5830ec7c
---
 .../base/core/res/res/values/config.xml           | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index f7058380..31b59d74 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -266,4 +266,19 @@
 
     <!-- Enable Zram writeback feature to allow unused pages in zram be written to flash. -->
     <bool name="config_zramWriteback">true</bool>
+
+    <!-- Configure tcp buffer sizes in the form:
+         rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max
+         If this is configured as an empty string, the system default will be applied.
+
+         For now this config is used by mobile data only. In the future it should be
+         used by Wi-Fi as well.
+
+         Note that starting from Android 13, the TCP buffer size is fixed after boot up, and should
+         never be changed based on carriers or the network types. The value should be configured
+         appropriately based on the device's memory and performance. It is recommended to use lower
+         values if the device has low memory or doesn't support high-speed network such like LTE,
+         NR, or Wifi.
+    -->
+    <string name="config_tcp_buffers" translatable="false">2097152,6291456,16777216,512000,2097152,8388608</string>
 </resources>