From: Jeremy Higdon <jeremy@sgi.com>
To: Nick Piggin <piggin@cyberone.com.au>
Cc: linux-kernel@vger.kernel.org, jbarnes@sgi.com, axboe@suse.de
Subject: Re: [PATCH] per-backing dev unplugging #2
Date: Mon, 15 Mar 2004 23:20:46 -0800 [thread overview]
Message-ID: <20040316072046.GA636090@sgi.com> (raw)
In-Reply-To: <4056A062.6040203@cyberone.com.au>
On Tue, Mar 16, 2004 at 05:36:18PM +1100, Nick Piggin wrote:
>
>
> Jeremy Higdon wrote:
>
> >My tests were on an 8 CPU x 1300 MHz Altix with 64 disks.
> >
> >
>
> Nice - so if you had enough IO capacity to saturate the CPUs it
> might come close to a 4x improvement - and this sounds like one
> of your baby systems?
Baby by cpu count, mid size by I/O capability. Extrapolations of
this sort are fraught with peril. However, it is conceivable that
we would end up with 4X the IOPS.
> I wonder why nobody's complained about this before?
Well, some of us have, but probably not very loudly. I had
naively believed that the global unplug was gone in 2.6.
jeremy
next prev parent reply other threads:[~2004-03-16 16:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-16 5:22 [PATCH] per-backing dev unplugging #2 Jeremy Higdon
2004-03-16 6:36 ` Nick Piggin
2004-03-16 7:20 ` Jeremy Higdon [this message]
2004-03-16 7:38 ` Jens Axboe
2004-03-17 0:23 ` Jeremy Higdon
2004-03-16 7:46 ` Nick Piggin
2004-03-16 7:29 ` Jens Axboe
2004-03-16 17:20 ` Jesse Barnes
-- strict thread matches above, loose matches on Subject: below --
2004-03-11 8:36 Jens Axboe
2004-03-11 22:44 ` Nathan Scott
2004-03-12 1:23 ` William Lee Irwin III
2004-03-12 6:41 ` Ingo Oeser
2004-03-12 8:04 ` Jens Axboe
2004-03-12 19:51 ` Chris Mason
2004-03-12 20:03 ` Andrew Morton
2004-03-12 20:02 ` Jens Axboe
2004-03-12 20:34 ` Chris Mason
2004-03-12 20:34 ` Jens Axboe
2004-03-12 20:41 ` Chris Mason
2004-03-12 20:51 ` Jens Axboe
2004-03-14 20:43 ` Chris Mason
2004-03-14 20:47 ` Jens Axboe
2004-03-14 20:57 ` Chris Mason
2004-03-14 21:04 ` Andrew Morton
2004-03-14 21:09 ` Jens Axboe
2004-03-15 21:58 ` Chris Mason
2004-03-12 20:06 ` Chris Mason
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