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

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Date:	Mon, 16 Jul 2007 10:05:15 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 00/33] SG table chaining support

Jens> A repost of this patchset, which adds support forchaining of sg
Jens> tables.  This enables much larger IO commands, since we don't
Jens> have to allocate large consecutive pieces of memory to represent
Jens> the sgtable of a huge command. Right now Linux is limited to
Jens> somewhere between 128 and 256 segments, depending on the
Jens> architecture. This translates into at most 512k-1mb request
Jens> sizes. With this patchset, I've successfully pushed 10MiB
Jens> commands through the IO stack.

Will this help out tape drive performance at all?  I looked through
the patches quickly, esp the AIC7xxx stuff since that's what I use,
but nothing jumped out at me...

John
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