From: Thomas Glanzmann <thomas@glanzmann.de>
To: Eric Dumazet <edumazet@google.com>,
"David S. Miller" <davem@davemloft.net>,
"Nicholas A. Bellinger" <nab@linux-iscsi.org>,
target-devel <target-devel@vger.kernel.org>,
Linux Network Development <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] tcp: disable auto corking by default
Date: Sat, 8 Feb 2014 10:19:44 +0100 [thread overview]
Message-ID: <20140208091944.GB16336@glanzmann.de> (raw)
In-Reply-To: <20140208091828.GA16336@glanzmann.de>
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@glanzmann.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
next prev parent reply other threads:[~2014-02-08 9:19 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20140206153640.GB4103@glanzmann.de>
[not found] ` <1391727771.14985.41.camel@haakon3.risingtidesystems.com>
[not found] ` <20140207051500.GB10916@glanzmann.de>
[not found] ` <20140207075536.GB17815@glanzmann.de>
[not found] ` <1391801597.1155.28.camel@haakon3.risingtidesystems.com>
[not found] ` <20140207205142.GA8609@glanzmann.de>
2014-02-08 9:18 ` REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] Thomas Glanzmann
2014-02-08 9:19 ` Thomas Glanzmann [this message]
2014-02-08 15:04 ` [PATCH] tcp: disable auto corking by default Eric Dumazet
2014-02-08 16:55 ` Thomas Glanzmann
2014-02-08 17:12 ` Eric Dumazet
2014-02-08 17:20 ` Thomas Glanzmann
2014-02-08 9:23 ` REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] Thomas Glanzmann
2014-02-08 9:38 ` Thomas Glanzmann
2014-02-08 13:14 ` Eric Dumazet
2014-02-08 13:33 ` Eric Dumazet
2014-02-08 13:38 ` Thomas Glanzmann
2014-02-08 13:50 ` Eric Dumazet
2014-02-08 14:13 ` Eric Dumazet
2014-02-08 14:19 ` Thomas Glanzmann
2014-02-08 14:30 ` Eric Dumazet
2014-02-08 15:00 ` Thomas Glanzmann
2014-02-08 15:06 ` Eric Dumazet
2014-02-08 16:57 ` Thomas Glanzmann
2014-02-08 17:08 ` Eric Dumazet
2014-02-08 17:15 ` Thomas Glanzmann
2014-02-08 19:12 ` Eric Dumazet
2014-02-08 21:36 ` Thomas Glanzmann
2014-02-09 0:15 ` Eric Dumazet
2014-02-09 7:45 ` Thomas Glanzmann
2014-02-09 7:40 ` RFC: Set MSG_MORE in iscsit_fe_sendpage_sg to avoid sending multiple TCP packets instead of one Thomas Glanzmann
2014-02-09 7:42 ` [PATCH] This extends tx_data and and iscsit_do_tx_data with the additional parameter flags and avoids sending multiple TCP packets in iscsit_fe_sendpage_sg Eric Dumazet
2014-02-09 12:30 ` Eric Dumazet
2014-02-09 15:07 ` Thomas Glanzmann
2014-02-10 18:58 ` Nicholas A. Bellinger
2014-02-10 20:56 ` Thomas Glanzmann
2014-02-10 21:01 ` Eric Dumazet
2014-02-10 21:14 ` Thomas Glanzmann
2014-02-08 13:37 ` REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] Thomas Glanzmann
2014-02-08 13:53 ` Eric Dumazet
2014-02-08 13:58 ` Thomas Glanzmann
2014-02-08 14:09 ` Eric Dumazet
2014-02-08 14:12 ` Thomas Glanzmann
2014-02-17 14:08 ` Thomas Glanzmann
2014-02-17 15:26 ` Eric Dumazet
2014-02-17 15:32 ` Thomas Glanzmann
2014-02-17 15:46 ` Eric Dumazet
2014-02-17 15:46 ` Thomas Glanzmann
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