linux-kernel - Re: [RFC, PATCH] cfq-iosched: remove redundant queuing detection code

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Message-ID: <x49vdhi5smz.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 10 Nov 2009 10:03:32 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	"Linux-Kernel" <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [RFC, PATCH] cfq-iosched: remove redundant queuing detection code

Corrado Zoccolo <czoccolo@...il.com> writes:

> The core block layer already has code to detect presence of command
> queuing devices. We convert cfq to use that instead of re-doing the
> computation.

This sounds like a good idea to me, and it appears the same number of
requests will be used to detect command queuing.  I'm surprised we can't
just query each device to detect this, honestly.

One thing you missed, though, was removing the CFQ_HW_QUEUE_MIN define.

Cheers,
Jeff
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