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Network slowdown due to CFS

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From: Martin Michlmayr
Subject: Network slowdown due to CFS
Date: Wednesday, September 26, 2007 - 1:52 am

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.

I did a git bisect today and tracked it back to the commit where CFS
was enabled ("sched: cfs core code; apply the CFS core code",
commit dd41f596cda0d7d6e4a8b139ffdfabcefdd46528).  I also compiled a
kernel from
git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel.git
but things don't improve.

This is on a Thecus N2100, an ARM (Intel IOP32x) based storage device
with a r8169 card, SATA disks and 512 MB RAM.  My config is attached.

What kind of information can I supply so you can track this down?
-- 
Martin Michlmayr
http://www.cyrius.com/
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Messages in current thread:
Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 1:52 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 2:34 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 2:47 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 3:08 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 3:18 am)
Re: Network slowdown due to CFS, Mike Galbraith, (Wed Sep 26, 3:20 am)
Re: Network slowdown due to CFS, Mike Galbraith, (Wed Sep 26, 3:23 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 3:48 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 4:21 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 4:29 am)
RE: Network slowdown due to CFS, David Schwartz, (Wed Sep 26, 5:00 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 6:31 am)
Re: Network slowdown due to CFS, Stephen Hemminger, (Wed Sep 26, 8:40 am)
Re: Network slowdown due to CFS, Stephen Hemminger, (Wed Sep 26, 8:46 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Thu Sep 27, 2:30 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 2:46 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 2:49 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Thu Sep 27, 3:54 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 3:56 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Thu Sep 27, 4:12 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Thu Sep 27, 5:27 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 6:31 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Thu Sep 27, 7:42 am)
Re: Network slowdown due to CFS, Nick Piggin, (Thu Sep 27, 11:10 pm)
Re: Network slowdown due to CFS, Jarek Poplawski, (Mon Oct 1, 1:43 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 9:25 am)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 9:49 am)
Re: Network slowdown due to CFS, Chris Friesen, (Mon Oct 1, 9:55 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 10:09 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 10:31 am)
Re: Network slowdown due to CFS, Chris Friesen, (Mon Oct 1, 10:45 am)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 11:23 am)
Re: iperf yield usage, Ingo Molnar, (Mon Oct 1, 12:09 pm)
Re: Network slowdown due to CFS, Arjan van de Ven, (Mon Oct 1, 12:53 pm)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 3:17 pm)
Re: Network slowdown due to CFS, Arjan van de Ven, (Mon Oct 1, 3:35 pm)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 3:44 pm)
Re: Network slowdown due to CFS, Arjan van de Ven, (Mon Oct 1, 3:55 pm)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 11:06 pm)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 11:08 pm)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 11:26 pm)
Re: yield API, Ingo Molnar, (Mon Oct 1, 11:46 pm)
Re: Network slowdown due to CFS, Andi Kleen, (Mon Oct 1, 11:47 pm)
Re: Network slowdown due to CFS, Jarek Poplawski, (Tue Oct 2, 2:03 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Tue Oct 2, 2:26 am)
Re: yield API, linux-os (Dick Johnson), (Tue Oct 2, 4:50 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Tue Oct 2, 6:39 am)
Re: yield API, Douglas McNaught, (Tue Oct 2, 8:24 am)
RE: Network slowdown due to CFS, David Schwartz, (Tue Oct 2, 8:37 am)
Re: yield API, Eric St-Laurent, (Tue Oct 2, 2:57 pm)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 12:15 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 1:02 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Oct 3, 1:16 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 1:56 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Oct 3, 2:10 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 2:50 am)
Re: Network slowdown due to CFS, Dmitry Adamushko, (Wed Oct 3, 3:55 am)
Re: Network slowdown due to CFS, Dmitry Adamushko, (Wed Oct 3, 3:58 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 4:20 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Oct 3, 4:22 am)
Re: Network slowdown due to CFS, Helge Hafting, (Wed Oct 3, 4:31 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 4:40 am)
Re: yield, Ingo Molnar, (Wed Oct 3, 4:56 am)
Re: yield, Jarek Poplawski, (Wed Oct 3, 5:16 am)
RE: Network slowdown due to CFS, Rusty Russell, (Wed Oct 3, 5:31 pm)
Re: Network slowdown due to CFS, Casey Dahlin, (Wed Oct 3, 10:33 pm)
Re: Network slowdown due to CFS, Ingo Molnar, (Sun Oct 7, 12:18 am)
Re: yield API, Kyle Moffett, (Wed Dec 12, 9:43 pm)
RE: yield API, David Schwartz, (Thu Dec 13, 1:10 pm)