From: Jakob Oestergaard <jakob@unthought.net>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Arjan van de Ven <arjan@infradead.org>,
"Phetteplace, Thad (GE Healthcare,
consultant)" <Thad.Phetteplace@ge.com>,
linux-kernel@vger.kernel.org
Subject: Re: Bandwidth Allocations under CFQ I/O Scheduler
Date: Wed, 18 Oct 2006 14:44:50 +0200 [thread overview]
Message-ID: <20061018124450.GX23492@unthought.net> (raw)
In-Reply-To: <1161175344.9363.30.camel@localhost.localdomain>
On Wed, Oct 18, 2006 at 01:42:24PM +0100, Alan Cox wrote:
> Ar Mer, 2006-10-18 am 14:23 +0200, ysgrifennodd Jakob Oestergaard:
> > iops/sec is what you get from your disks. In real world scenarios. It's
> > no more magic than the real world, and no harder to understand than real
> > world disks. Although I admit real-world disks can be a bitch at times ;)
>
> Even iops/sec is very vague and arbitary. If your disk happens to be
> retrying a sector or doing a cleaning pass or any other housekeeping or
> vibration damping and so on you'll get very different numbers.
True.
>
> Bandwidth is completely silly in this context, iops/sec is merely
> hopeless 8)
Thanks Alan - I feel much better now :)
--
/ jakob
next prev parent reply other threads:[~2006-10-18 12:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-16 20:46 Bandwidth Allocations under CFQ I/O Scheduler Phetteplace, Thad (GE Healthcare, consultant)
2006-10-17 1:24 ` Arjan van de Ven
2006-10-17 13:23 ` Jens Axboe
2006-10-17 14:37 ` Ric Wheeler
2006-10-17 14:47 ` Jens Axboe
2006-10-17 14:46 ` Phetteplace, Thad (GE Healthcare, consultant)
2006-10-18 8:00 ` Jakob Oestergaard
2006-10-18 9:40 ` Arjan van de Ven
2006-10-18 11:30 ` Jakob Oestergaard
2006-10-18 11:49 ` Jens Axboe
2006-10-18 12:23 ` Jakob Oestergaard
2006-10-18 12:42 ` Alan Cox
2006-10-18 12:44 ` Jens Axboe
2006-10-18 12:55 ` Nick Piggin
2006-10-18 13:04 ` Jens Axboe
2006-10-18 13:39 ` Jakob Oestergaard
2006-10-18 13:51 ` Paulo Marques
2006-10-19 12:22 ` Jens Axboe
2006-10-18 13:37 ` Jakob Oestergaard
2006-10-18 12:44 ` Jakob Oestergaard [this message]
2006-10-18 12:42 ` Jens Axboe
2006-10-18 13:35 ` Jakob Oestergaard
2006-10-18 9:51 ` Jens Axboe
2006-10-18 11:00 ` Helge Hafting
2006-10-18 11:14 ` Jens Axboe
2006-10-18 11:23 ` Ric Wheeler
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