linux-kernel - Re: [PATCH] Promise 'stex' driver

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Message-ID: <20060721010724.GB24176@suse.de>
Date:	Fri, 21 Jul 2006 03:07:24 +0200
From:	Jens Axboe <axboe@...e.de>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	James Bottomley <James.Bottomley@...elEye.com>,
	Ed Lin <ed.lin@...mise.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	hch <hch@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm <akpm@...l.org>, promise_linux <promise_linux@...mise.com>
Subject: Re: [PATCH] Promise 'stex' driver

On Thu, Jul 20 2006, Jeff Garzik wrote:
> James Bottomley wrote:
> >On Thu, 2006-07-20 at 17:27 -0400, Jeff Garzik wrote:
> >>Since _no individual SCSI driver_ uses the block layer
> >>tagging, it is likely that some instability and core kernel
> >>development
> >>will occur, in order to make that work.
> >
> >That's not quite true: 53c700 and tmscsim both use it ... I could with
> >the usage were wider, but at least 53c700 has pretty regular and
> >constant usage ... enough I think to validate the block tag code (it's
> >been using it for the last three years).
> 
> Not for the case being discussed in this thread, adapter-wide tags.

That just means the map is shared, otherwise there should be little if
any difference.

> AFAICS, no file in include/scsi/* or drivers/scsi/* ever calls 
> blk_queue_init_tags() with a non-NULL third arg.

grpe again, it's in scsi_tcq.h.

> The block tagging capability being discussed here is poorly validated 
> due to overall underuse, and its never been used in SCSI AFAIK.

It has and is, James uses it every day!

-- 
Jens Axboe

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