From: "Denys" <nuclearcat@nuclearcat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression
Date: Mon, 1 Oct 2007 15:04:19 +0300
Message-Id: <20071001120231.M48591@nuclearcat.com>
In-Reply-To: <20071001115721.GB17357@one.firstfloor.org>
References: <20070930144443.M52139@visp.net.lb> <46FFE17C.9020202@cosmosbay.com> <200709301425.37564.nickpiggin@yahoo.com.au> <20070930220452.M25621@nuclearcat.com> <p73myv36tmz.fsf@bingen.suse.de> <20071001103026.M59805@nuclearcat.com> <20071001111441.GA17357@one.firstfloor.org> <20071001114715.M51349@nuclearcat.com> <20071001115721.GB17357@one.firstfloor.org>
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That 2.6.21 works fine and 2.6.22 MUCH worse on multiple servers with similar
workload.
Plus all userspace becoming extremely unstable, and definitely ping 127.0.0.1
must not reach 300ms.


On Mon, 1 Oct 2007 13:57:21 +0200, Andi Kleen wrote
> On Mon, Oct 01, 2007 at 02:52:03PM +0300, Denys wrote:
> > Hi
> > 
> > No major differences. 
> > Some procedures higher a bit, some lower a bit, but everything looks fine on
> > both kernels.
> > 
> > Thats what i tried first - oprofile, and only one keypoint i was able to catch
> > - in top softirqd/0 or /1 shows usage 100% cpu, and in mpstat - soft% also
> > reaching 100%.
> 
> Then you likely just have higher load. What makes you think this
> is a kernel problem?
> 
> -Andi


--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.

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