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Date: Tue, 24 Jul 2007 12:45:52 -0700 (PDT)
Message-Id: <20070724.124552.72716820.davem@davemloft.net>
To: atporter@primate.net
Cc: andi@firstfloor.org, linux-kernel@vger.kernel.org
Subject: Re: miserable performance of 2.6.21 under network load
From: David Miller <davem@davemloft.net>
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From: Aaron Porter <atporter@primate.net>
Date: Tue, 24 Jul 2007 11:49:09 -0700

> samples  %        app name                 symbol name
> 914379   48.8404  vmlinux-2.6.21.5         check_poison_obj
> 341920   18.2632  vmlinux-2.6.21.5         poison_obj
> 37355     1.9953  nf_conntrack             (no symbols)

You have SLAB debugging enabled, turn it off if you want
decent performance.