linux-kernel - Re: [PATCH 00/33] SG table chaining support

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Date:	Mon, 16 Jul 2007 19:02:09 +0300 (EEST)
From:	Kai Makisara <Kai.Makisara@...umbus.fi>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
cc:	John Stoffel <john@...ffel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 00/33] SG table chaining support

On Mon, 16 Jul 2007, Martin K. Petersen wrote:

> >>>>> "John" == John Stoffel <john@...ffel.org> writes:
> 
> John> Will this help out tape drive performance at all?  I looked
> John> through the patches quickly, esp the AIC7xxx stuff since that's
> John> what I use, but nothing jumped out at me...
> 
> Yes.  Most modern tape drives want a block size of 1MB or higher.
> With the old stack we'd be stuck at 512KB because the sg limitations
> caused us to come just short of 1MB...
> 
Tape block sizes up to 16 MB have been possible for a very long time but 
this has required tuning of the block/scsi parameters. Very few people 
seem to have done this and the common (mis)belief seems to be that the 
tape block size limit has been 512 kB. It is good if this tuning is not
needed in future.

-- 
Kai
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