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Date: Tue, 24 Jul 2007 13:41:15 -0700
From: Aaron Porter <atporter@primate.net>
To: Andi Kleen <andi@firstfloor.org>
Cc: David Miller <davem@davemloft.net>, Chris Snook <csnook@redhat.com>,
       linux-kernel@vger.kernel.org
Subject: Re: miserable performance of 2.6.21 under network load
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References: <20070724172513.GB24543@primate.net> <p73vec9sknz.fsf@bingen.suse.de> <20070724184908.GD24543@primate.net> <20070724191347.GB359@one.firstfloor.org>
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On Tue, Jul 24, 2007 at 09:13:47PM +0200, Andi Kleen wrote:

> You have slab debugging enabled. That makes everything slow.
> It costs you ~66% of your CPU time.  Disable it.

	Past peak for the day, but this does look like the culprit. Thanks
to all who replied.