From: Mike Galbraith <efault@gmx.de>
To: Martin Michlmayr <tbm@cyrius.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: Network slowdown due to CFS
Date: Wed, 26 Sep 2007 12:20:32 +0200 [thread overview]
Message-ID: <1190802032.7318.1.camel@Homer.simpson.net> (raw)
In-Reply-To: <20070926085202.GE3337@deprecation.cyrius.com>
On Wed, 2007-09-26 at 10:52 +0200, Martin Michlmayr wrote:
> I noticed that my network performance has gone down from 2.6.22
> >from [ 3] 0.0-10.0 sec 113 MBytes 95.0 Mbits/sec
> to [ 3] 0.0-10.0 sec 75.7 MBytes 63.3 Mbits/sec
> with 2.6.23-rc1 (and 2.6.23-rc8), as measured with iperf.
FWIW, on my box blasting localhost, I see the opposite, repeatably.
root@Homer: iperf -v
iperf version 2.0.2 (03 May 2005) pthreads
2.6.22.1-smp
for i in `seq 1 3`; do iperf -c localhost; done >> /xx
------------------------------------------------------------
Client connecting to localhost, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 21383 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.1 sec 518 MBytes 432 Mbits/sec
------------------------------------------------------------
Client connecting to localhost, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 21384 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.0 sec 325 MBytes 273 Mbits/sec
------------------------------------------------------------
Client connecting to localhost, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 21385 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.0 sec 434 MBytes 363 Mbits/sec
2.6.23-rc8-smp-d
for i in `seq 1 3`; do iperf -c localhost; done >> /xx
------------------------------------------------------------
Client connecting to localhost, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 11650 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.0 sec 2.01 GBytes 1.72 Gbits/sec
------------------------------------------------------------
Client connecting to localhost, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 11651 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.0 sec 2.02 GBytes 1.74 Gbits/sec
------------------------------------------------------------
Client connecting to localhost, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 11652 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.0 sec 2.10 GBytes 1.81 Gbits/sec
next prev parent reply other threads:[~2007-09-26 10:20 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-26 8:52 Network slowdown due to CFS Martin Michlmayr
2007-09-26 9:34 ` Ingo Molnar
2007-09-26 9:47 ` Ingo Molnar
2007-09-26 10:08 ` Martin Michlmayr
2007-09-26 10:18 ` Ingo Molnar
2007-09-26 10:20 ` Mike Galbraith [this message]
2007-09-26 10:23 ` Mike Galbraith
2007-09-26 10:48 ` Martin Michlmayr
2007-09-26 11:21 ` Ingo Molnar
2007-09-26 11:29 ` Martin Michlmayr
2007-09-26 12:00 ` David Schwartz
2007-09-26 13:31 ` Ingo Molnar
2007-09-26 15:40 ` Stephen Hemminger
2007-09-26 15:46 ` Stephen Hemminger
2007-09-27 9:30 ` Jarek Poplawski
2007-09-27 9:46 ` Ingo Molnar
2007-09-27 12:27 ` Jarek Poplawski
2007-09-27 13:31 ` Ingo Molnar
2007-09-27 14:42 ` Jarek Poplawski
2007-09-28 6:10 ` Nick Piggin
2007-10-01 8:43 ` Jarek Poplawski
2007-10-01 16:25 ` Ingo Molnar
2007-10-01 16:49 ` David Schwartz
2007-10-01 17:31 ` Ingo Molnar
2007-10-01 18:23 ` David Schwartz
2007-10-02 6:06 ` Ingo Molnar
2007-10-02 6:47 ` Andi Kleen
2007-10-03 8:02 ` Jarek Poplawski
2007-10-03 8:16 ` Ingo Molnar
2007-10-03 8:56 ` Jarek Poplawski
2007-10-03 9:10 ` Ingo Molnar
2007-10-03 9:50 ` Jarek Poplawski
2007-10-03 10:55 ` Dmitry Adamushko
2007-10-03 10:58 ` Dmitry Adamushko
2007-10-03 11:20 ` Jarek Poplawski
2007-10-03 11:22 ` Ingo Molnar
2007-10-03 11:40 ` Jarek Poplawski
2007-10-03 11:56 ` yield Ingo Molnar
2007-10-03 12:16 ` yield Jarek Poplawski
2007-10-07 7:18 ` Network slowdown due to CFS Ingo Molnar
2007-10-04 5:33 ` Casey Dahlin
2007-10-02 6:08 ` Ingo Molnar
2007-10-02 6:26 ` Ingo Molnar
2007-10-02 6:46 ` yield API Ingo Molnar
2007-10-02 11:50 ` linux-os (Dick Johnson)
2007-10-02 15:24 ` Douglas McNaught
2007-10-02 21:57 ` Eric St-Laurent
2007-12-12 22:39 ` Jesper Juhl
2007-12-13 4:43 ` Kyle Moffett
2007-12-13 20:10 ` David Schwartz
2007-10-01 19:53 ` Network slowdown due to CFS Arjan van de Ven
2007-10-01 22:17 ` David Schwartz
2007-10-01 22:35 ` Arjan van de Ven
2007-10-01 22:44 ` David Schwartz
2007-10-01 22:55 ` Arjan van de Ven
2007-10-02 15:37 ` David Schwartz
2007-10-03 7:15 ` Jarek Poplawski
2007-10-03 11:31 ` Helge Hafting
2007-10-04 0:31 ` Rusty Russell
2007-10-01 16:55 ` Chris Friesen
2007-10-01 17:09 ` Ingo Molnar
2007-10-01 17:45 ` Chris Friesen
2007-10-01 19:09 ` iperf yield usage Ingo Molnar
2007-10-02 9:03 ` Network slowdown due to CFS Jarek Poplawski
2007-10-02 13:39 ` Jarek Poplawski
2007-10-02 9:26 ` Jarek Poplawski
2007-09-27 9:49 ` Ingo Molnar
2007-09-27 10:54 ` Martin Michlmayr
2007-09-27 10:56 ` Ingo Molnar
2007-09-27 11:12 ` Martin Michlmayr
-- strict thread matches above, loose matches on Subject: below --
2007-10-01 22:27 Hubert Tonneau
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