linux-kernel - Re: [2.6 patch] make I/O schedulers non-modular

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Date:	Sun, 25 Nov 2007 15:27:45 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] make I/O schedulers non-modular

On Sun, 25 Nov 2007 17:56:54 +0100
Adrian Bunk <bunk@...nel.org> wrote:

> Is there any technical reason why we need 4 different schedulers at
> all?
> 

there is at least one technical reason to need more than one: certain
types of storage (both big EMC boxes as well as solid state disks)
don't behave like disks and have no seek penalty; any cpu time spent on
avoiding seeks is wasted on those, so for these devices one really
wants to use a different IO scheduler, one which is much lighter weight
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