netdev - [PATCH] tcp: disable auto corking by default

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Message-ID: <20140208091944.GB16336@glanzmann.de>
Date:	Sat, 8 Feb 2014 10:19:44 +0100
From:	Thomas Glanzmann <thomas@...nzmann.de>
To:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	target-devel <target-devel@...r.kernel.org>,
	Linux Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] tcp: disable auto corking by default

When using auto corking with iSCSI the round trip time at least increases by
factor 25 probably more. Other protocols are very likely also effected.

Signed-off-by: Thomas Glanzmann <thomas@...nzmann.de>
---
 net/ipv4/tcp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 4475b3b..da563a4 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -285,7 +285,7 @@ int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
 
 int sysctl_tcp_min_tso_segs __read_mostly = 2;
 
-int sysctl_tcp_autocorking __read_mostly = 1;
+int sysctl_tcp_autocorking __read_mostly = 0;
 
 struct percpu_counter tcp_orphan_count;
 EXPORT_SYMBOL_GPL(tcp_orphan_count);
-- 
1.7.10.4
--
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