linux-kernel - Re: [Xen-devel] [PATCH RFC 0/4] Multi-queue support for xen-blkfront and xen-blkback

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Date:	Mon, 15 Sep 2014 11:23:09 +0200
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Arianna Avanzini <avanzini.arianna@...il.com>,
	<konrad.wilk@...cle.com>, <boris.ostrovsky@...cle.com>,
	<david.vrabel@...rix.com>, <xen-devel@...ts.xenproject.org>,
	<linux-kernel@...r.kernel.org>
CC:	<axboe@...com>, <felipe.franciosi@...rix.com>
Subject: Re: [Xen-devel] [PATCH RFC 0/4] Multi-queue support for xen-blkfront
 and xen-blkback

El 22/08/14 a les 13.20, Arianna Avanzini ha escrit:
> Hello,
[...]
> The patchset implements in the backend driver the retrieval of information
> about the currently-in-use block layer API for a certain device and about
> the number of available submission queues, if the API turns out to be the
> multi-queue one. The information is then advertised to the frontend driver
> via XenStore. The frontend device can exploit such an information to allocate
> and grant multiple I/O rings that the backend will be able to map.
> The patchset has been tested with fio's IOmeter emulation on a four-cores
> machine with a null_blk device (some results are available here: [2]).

Have you tried if using multiple queues (rings) between blkfront and
blkback even when the underlying device doesn't use MQ increases the
throughput?

Roger.

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