linux-kernel - Re: [PATCH RFC 0/2] Convert from bio-based to blk-mq

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Message-ID: <20131008131036.GC7422@linux.intel.com>
Date:	Tue, 8 Oct 2013 09:10:36 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Matias Bjørling <m@...rling.me>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	linux-nvme@...ts.infradead.org
Subject: Re: [PATCH RFC 0/2] Convert from bio-based to blk-mq

On Tue, Oct 08, 2013 at 11:34:20AM +0200, Matias Bjørling wrote:
> The nvme driver implements itself as a bio-based driver. This primarily because
> of high lock congestion for high-performance nvm devices. To remove the
> congestion, a multi-queue block layer is being implemented.

Um, no.  You'll crater performance by adding another memory allocation
(of the struct request).  multi-queue is not the solution.
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