linux-kernel - Re: [PATCH] blk-merge: fix blk_recount

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Date:	Tue, 2 Sep 2014 09:21:46 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Kick In <pierre-andre.morey@...onical.com>,
	Chris J Arges <chris.j.arges@...onical.com>
Subject: Re: [PATCH] blk-merge: fix blk_recount_segments

Btw, one thing we should reconsider is where we set
QUEUE_FLAG_NO_SG_MERGE.  At least for virtio-blk it seems to me that
doing the S/G merge should be a lot cheaper than fanning out into the
indirect descriptors.

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