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Subject: Re: queue_nr_requests needs to be selective
To: akpm@zip.com.au (Andrew Morton)
Date: Fri, 1 Mar 2002 21:03:22 +0000 (GMT)
Cc: jmerkey@vger.timpanogas.org (Jeff V. Merkey), linux-kernel@vger.kernel.org
In-Reply-To: <3C7FE7DD.98121E87@zip.com.au> from "Andrew Morton" at Mar 01, 2002 12:43:09 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> I don't immediately see why increasing the queue length should
> increase bandwidth in this manner.  One possibility is that

Latency on the controllers ?  With caches on the controller and disks you
can have a lot of requests actually in flight

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