linux-kernel - Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression

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Date:	Mon, 1 Oct 2007 15:04:19 +0300
From:	"Denys" <nuclearcat@...learcat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression

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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