From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753648AbaIOJXN (ORCPT ); Mon, 15 Sep 2014 05:23:13 -0400 Received: from smtp.citrix.com ([66.165.176.89]:54726 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753488AbaIOJXM (ORCPT ); Mon, 15 Sep 2014 05:23:12 -0400 X-IronPort-AV: E=Sophos;i="5.04,526,1406592000"; d="scan'208";a="171468651" Message-ID: <5416AFFD.5090207@citrix.com> Date: Mon, 15 Sep 2014 11:23:09 +0200 From: =?windows-1252?Q?Roger_Pau_Monn=E9?= User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.1.1 MIME-Version: 1.0 To: Arianna Avanzini , , , , , CC: , Subject: Re: [Xen-devel] [PATCH RFC 0/4] Multi-queue support for xen-blkfront and xen-blkback References: <1408706404-6614-1-git-send-email-avanzini.arianna@gmail.com> In-Reply-To: <1408706404-6614-1-git-send-email-avanzini.arianna@gmail.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 8bit X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.