From: xiehang <xiehang@espressif.com>
Date: Thu, 9 May 2019 09:59:25 +0000 (+0800)
Subject:  Change the default value of TCP_MSS to 1440 and TCP_MSS Range : [576 1460]
X-Git-Tag: v4.0-beta1~344^2~1
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=67dd55eae87c17b6ddc8729e1f78ecd2b80fb700;p=esp-idf

 Change the default value of TCP_MSS to 1440 and TCP_MSS Range : [576 1460]
---

diff --git a/components/lwip/Kconfig b/components/lwip/Kconfig
index 2d7c5731ec..53ce0f3d4e 100644
--- a/components/lwip/Kconfig
+++ b/components/lwip/Kconfig
@@ -294,12 +294,14 @@ menu "LWIP"
 
         config TCP_MSS
             int "Maximum Segment Size (MSS)"
-            default 1436
-            range 1220 1436
+            default 1440
+            range 576 1460
             help
                 Set maximum segment size for TCP transmission.
 
-                Can be set lower to save RAM, the default value 1436 will give best throughput.
+                Can be set lower to save RAM, the default value 1460(ipv4)/1440(ipv6) will give best throughput.
+                IPv4 TCP_MSS Range: 576 <= TCP_MSS <= 1460
+                IPv6 TCP_MSS Range: 1220<= TCP_mSS <= 1440
 
         config TCP_MSL
             int "Maximum segment lifetime (MSL)"