linux-kernel - Re: [PATCH 01/10] block: make generic_make

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Message-ID: <alpine.LNX.2.00.1504281546340.19844@localhost.lm.intel.com>
Date:	Tue, 28 Apr 2015 16:01:26 +0000 (UTC)
From:	Keith Busch <keith.busch@...el.com>
To:	Christoph Hellwig <hch@....de>
cc:	Ming Lin <mlin@...nel.org>, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Dongsu Park <dongsu.park@...fitbricks.com>,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ming Lei <ming.lei@...onical.com>, Neil Brown <neilb@...e.de>,
	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	drbd-user@...ts.linbit.com, Jiri Kosina <jkosina@...e.cz>,
	Geoff Levand <geoff@...radead.org>, Jim Paris <jim@...n.com>,
	Joshua Morris <josh.h.morris@...ibm.com>,
	Philip Kelleher <pjk1939@...ux.vnet.ibm.com>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Keith Busch <keith.busch@...el.com>
Subject: Re: [PATCH 01/10] block: make generic_make_request handle	arbitrarily
 sized bios

On Tue, 28 Apr 2015, Christoph Hellwig wrote:
> This seems to lack support for QUEUE_FLAG_SG_GAPS to work around
> the retarded PPR format in the NVMe driver.

Might strong words, sir! I'm missing the context here, but I'll say PRP
is much more efficient for h/w to process over SGL, and the requirement
comes from that h/w rather than the driver.
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