linux-kernel - Re: [PATCH 02/11] block: kill QUEUE_ORDERED_BY

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Message-ID: <4C654100.3060307@vlnb.net>
Date:	Fri, 13 Aug 2010 16:56:32 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Tejun Heo <tj@...nel.org>
CC:	jaxboe@...ionio.com, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	hch@....de, James.Bottomley@...e.de, tytso@....edu,
	chris.mason@...cle.com, swhiteho@...hat.com,
	konishi.ryusuke@....ntt.co.jp, dm-devel@...hat.com, jack@...e.cz,
	rwheeler@...hat.com, hare@...e.de,
	Christoph Hellwig <hch@...radead.org>,
	Nick Piggin <npiggin@...nel.dk>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 02/11] block: kill QUEUE_ORDERED_BY_TAG

Hello Tejun,

Tejun Heo, on 08/12/2010 04:41 PM wrote:
> Nobody is making meaningful use of ORDERED_BY_TAG now and queue
> draining for barrier requests will be removed soon which will render
> the advantage of tag ordering moot.

Have you seen Hannes Reinecke's and my measurements in 
http://marc.info/?l=linux-scsi&m=128110662528485&w=2 and 
http://marc.info/?l=linux-scsi&m=128111995217405&w=2 correspondingly?

If yes, what else evidences do you need to see that the tag ordering is 
a big performance win?

Vlad
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