linux-kernel - Re: miserable performance of 2.6.21 under network load

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Message-ID: <20070724204114.GF24543@primate.net>
Date:	Tue, 24 Jul 2007 13:41:15 -0700
From:	Aaron Porter <atporter@...mate.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	David Miller <davem@...emloft.net>,
	Chris Snook <csnook@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: miserable performance of 2.6.21 under network load

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.
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