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Date: Fri, 21 Mar 2003 02:01:35 +1100
From: Nick Piggin <piggin@cyberone.com.au>
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To: Jens Axboe <axboe@suse.de>
CC: Andrew Morton <akpm@digeo.com>, Joel.Becker@oracle.com,
       linux-kernel@vger.kernel.org
Subject: Re: WimMark I report for 2.5.65-mm2
References: <20030319232812.GJ2835@ca-server1.us.oracle.com> <20030319175726.59d08fba.akpm@digeo.com> <20030320003858.GM2835@ca-server1.us.oracle.com> <20030320080449.GL4990@suse.de> <20030320002050.44f13857.akpm@digeo.com> <20030320082947.GM4990@suse.de>
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Jens Axboe wrote:

>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.
>
You are quite right of course, Jens. I did tell Joel not to worry
about the other schedulers for a while just while I was trying to
get AS even close to their performance. I thought it would take a
bit longer to get there. It appears to be now, so yes, deadline
runs will be nice.

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