netdev - [PATCH 2/3] tcp_cubic: make the delay threshold of HyStart less sensitive

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Date:	Sun, 13 Mar 2011 20:04:02 -0400
From:	Sangtae Ha <sangtae.ha@...il.com>
To:	Lucas Nussbaum <lucas.nussbaum@...ia.fr>
Cc:	Stephen Hemminger <stephen.hemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	Injong Rhee <rhee@...u.edu>,
	Bill Fink <billfink@...dspring.com>, <netdev@...r.kernel.org>,
	Sangtae Ha <sangtae.ha@...il.com>
Subject: [PATCH 2/3] 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@...il.com>
---
 net/ipv4/tcp_cubic.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index ab9f888..b758db1 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)
 
-- 
1.7.0.4

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