From 2b4636a5f8ca547000f6aba24ec1c58f31f4a91d Mon Sep 17 00:00:00 2001
From: Sangtae Ha <sangtae.ha@gmail.com>
Date: Mon, 14 Mar 2011 07:52:17 +0000
Subject: tcp_cubic: make the delay threshold of HyStart less sensitive

Make HyStart less sensitive to abrupt delay variations due to buffer bloat.

Signed-off-by: Sangtae Ha <sangtae.ha@gmail.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Reported-by: Lucas Nussbaum <lucas.nussbaum@loria.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/tcp_cubic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index 5e0491d742ca..7172c129ff19 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -39,7 +39,7 @@
 
 /* Number of delay samples for detecting the increase of delay */
 #define HYSTART_MIN_SAMPLES	8
-#define HYSTART_DELAY_MIN	(2U<<3)
+#define HYSTART_DELAY_MIN	(4U<<3)
 #define HYSTART_DELAY_MAX	(16U<<3)
 #define HYSTART_DELAY_THRESH(x)	clamp(x, HYSTART_DELAY_MIN, HYSTART_DELAY_MAX)
 
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