From: Guy Van Sanden <n.b@myrealbox.com>
To: Clint Byrum <cbyrum@spamaps.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: Heavy iowait on 2.6 kernels
Date: Wed, 16 Jun 2004 09:25:31 +0200 [thread overview]
Message-ID: <1087369893.11205.36.camel@cronos.home.vsb> (raw)
In-Reply-To: <1087366549.1190.6.camel@lancelot>
My machine is heavily used for all kinds of file serving (mainly nfs),
but also samba.
Next to that, it is my home-server, so it runs apache2 (tuned to server
only few clients), imap (cyrus), postfix, bugzilla (mysql) and distcc
(used only a few times a week).
It replaces a FreeBSD system (PII-333) running the same except distcc.
Under
The disk system is just a regular IDE disk (udma5) (60GB) and one
external drive over USB2 (160 GB). The external drive is rather slow
(20-30 MB/sec), so I disabled it during the tests.
The weird thing is that I see this problem too when only running bonnie.
A friend of mine tried that too under 2.6.6, his iowait went up to
0.15%, mine to 99%.
On Wed, 2004-06-16 at 08:15, Clint Byrum wrote:
> On Fri, 2004-06-11 at 01:35, 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.
>
> This appears similar to the problem both myself and Phy Prahbab reported
> about 2.6 and hitting the disks too often.
>
> I'm wondering, what kind of workload does your machine see, and what
> sort of disk system is in it?
>
>
> -
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--
______________________________________________________________________
Guy Van Sanden
http://unixmafia.port5.com
Registered Linux user #249404 - September 1997
______________________________________________________________________
next prev parent reply other threads:[~2004-06-16 7:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-11 8:35 Guy Van Sanden
2004-06-12 6:31 ` Nick Piggin
2004-06-16 6:15 ` Clint Byrum
2004-06-16 7:25 ` Guy Van Sanden [this message]
2004-06-16 7:45 ` Nick Piggin
2004-06-16 12:21 ` Guy Van Sanden
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