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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Guy Van Sanden <n.b@myrealbox.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: Heavy iowait on 2.6 kernels
Date: Sat, 12 Jun 2004 16:31:52 +1000	[thread overview]
Message-ID: <40CAA358.9070603@yahoo.com.au> (raw)
In-Reply-To: <1086942905.10540.69.camel@cronos.home.vsb>

Guy Van Sanden wrote:
> I recently discovered why my new Gentoo server slows to a crawl on a
> intermediate load on the 2.6 kernel series.  The reason seems to be an
> unusual amount of iowait.
> I can reproduce this on two systems, one with a KT400 and and one with
> Sis735 chipset.
> 
> iostat -c 1 (or vmstat) while running something like bonnie produces
> iowaits of 99%.
> Any 2.6 kernel responds the same (regardless of the patchset), even
> vanilla. (2.6.5-mm, 2.6.6-mm, 2.6.6-vanilla and 2.6.5-gentoo-r1).
> Any 2.4-series kernel is fine.
> 

Hi, can you try booting with elevator=deadline, please?
Then include a vmstat 1 output for a 2.6 and a 2.4 kernel.

I don't think 2.4 kernels will show iowait, so some real
performance measurements would be helpful.

Thanks


  reply	other threads:[~2004-06-12  6:32 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-06-11  8:35 PROBLEM: Heavy iowait on 2.6 kernels Guy Van Sanden
2004-06-12  6:31 ` Nick Piggin [this message]
2004-06-16  6:15 ` Clint Byrum
2004-06-16  7:25   ` Guy Van Sanden
2004-06-16  7:45     ` Nick Piggin
2004-06-16 12:21       ` Guy Van Sanden

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