From: Jens Axboe <axboe@suse.de>
To: Simone Piunno <simone.piunno@wseurope.com>
Cc: Fabio Coatti <fabio.coatti@wseurope.com>,
Baruch Even <baruch@ev-en.org>,
Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>,
linux-kernel@vger.kernel.org
Subject: Re: bonnie++ uninterruptible under heavy I/O load
Date: Fri, 11 Mar 2005 17:00:48 +0100 [thread overview]
Message-ID: <20050311160048.GM28188@suse.de> (raw)
In-Reply-To: <200503111658.04499.simone.piunno@wseurope.com>
On Fri, Mar 11 2005, Simone Piunno wrote:
> Alle 16:54, venerdì 11 marzo 2005, Jens Axboe ha scritto:
>
> > I'd guess that your problem is queueing, if you have a ton of pending
> > requests in the hardware it will take forever to get a new request
> > through. There's nothing the io scheduler can do to help you there,
> > really. The /proc/driver/cciss/cciss0 you originall posted, was that
> > from before or after running bonnie++? I have no latency experience with
> > cciss, at least IDE/SATA/SCSI should work alright.
>
> It was after running bonnie++.
Are you sure? It lists only 190 commands run since it initialized,
that's basically nothing. 6 was the highest depth, should not be enough
to cause serious latency issues unless it was constantly at 6.
--
Jens Axboe
next prev parent reply other threads:[~2005-03-11 16:06 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-11 11:08 Simone Piunno
2005-03-11 11:35 ` Denis Vlasenko
2005-03-11 13:20 ` Fabio Coatti
2005-03-11 13:29 ` Baruch Even
2005-03-11 14:14 ` Simone Piunno
2005-03-11 15:16 ` Jens Axboe
2005-03-11 15:50 ` Fabio Coatti
2005-03-11 15:54 ` Jens Axboe
2005-03-11 15:58 ` Simone Piunno
2005-03-11 16:00 ` Jens Axboe [this message]
2005-03-11 16:24 ` Simone Piunno
2005-03-11 14:24 Christian Guggenberger
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