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

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Message-ID: <5405EF38.60007@kernel.dk>
Date:	Tue, 02 Sep 2014 10:24:24 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>,
	Ming Lei <ming.lei@...onical.com>
CC:	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

On 09/02/2014 10:21 AM, Christoph Hellwig wrote:
> 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.

And we might consider flipping the default, as most would probably like
to have the sg merging on.

-- 
Jens Axboe

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