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Date: Thu, 20 Mar 2003 09:29:47 +0100
From: Jens Axboe <axboe@suse.de>
To: Andrew Morton <akpm@digeo.com>
Cc: Joel.Becker@oracle.com, linux-kernel@vger.kernel.org
Subject: Re: WimMark I report for 2.5.65-mm2
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On Thu, Mar 20 2003, Andrew Morton wrote:
> Jens Axboe <axboe@suse.de> wrote:
> >
> > Besides, deadline is still the most solid choice.
> 
> Deadline will always be the best choice for OLTP workloads.  Or CFQ - it
> should perform the same.
> 
> All this workload does is seeks all over the disk doing teeny synchronous
> I/O's.  It is the worst-case for AS.
> 
> What we are trying to do at present is to make AS not _too_ bad for these
> workloads so that people with mixed workloads or who are not familiar with
> kernel arcanery don't accidentally end up with something which is
> significantly slower than it should be.
> 
> It is an interesting test case.

I understand that. A deadline run is still interesting if there are
regressions from -mm2 to -mm3, for example. If deadline shows the same
regression, it's likely not a newly introduced AS bug.

-- 
Jens Axboe

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