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Date: Sat, 15 Feb 2003 18:25:38 +1100
From: Nick Piggin <piggin@cyberone.com.au>
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To: Andrew Morton <akpm@digeo.com>
CC: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: 2.5.61-mm1
References: <20030214231356.59e2ef51.akpm@digeo.com>
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Andrew Morton wrote:

>http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.61/2.5.61-mm1/
>
>. Jens has fixed the request queue aliasing problem and we are no longer
>  able to break the IO scheduler.  This was preventing the OSDL team from
>  running dbt2 against recent kernels, so hopefully that is all fixed up now.
>
>. The anticipatory scheduler is performing well.  I've included that now.
>
And for those interested, if you find unusual IO performance,
please try disabling AS and reporting results. Thanks.

echo 0 > /sys/block/?/iosched/antic_expire

This value defaults to 10 (ms). More than around 20 might do
funny though not harmful stuff due to a fragile bitshift.

Nick


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