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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/5] mtip32xx: handle arbitrary size bios
Date: Mon, 25 Nov 2013 22:10:18 -0800
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Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	axboe@kernel.dk, Asai Thambi S P <asamymuthupa@micron.com>,
	Sam Bradshaw <sbradshaw@micron.com>
To: Kent Overstreet <kmo@daterainc.com>
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On Mon, Nov 25, 2013 at 02:30:30PM -0800, Kent Overstreet wrote:
> We get a measurable performance increase by handling this in the driver when
> we're already looping over the biovec, instead of handling it separately in
> generic_make_request() (or bio_add_page() originally)

Given that Jens has a patch queue up to convert the driver to blk-mq
adjusting the blk-mq infrastructure to handle this might be a better
plan forward..