From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756403AbaHVNQD (ORCPT ); Fri, 22 Aug 2014 09:16:03 -0400 Received: from smtp.citrix.com ([66.165.176.89]:33954 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756250AbaHVNQB (ORCPT ); Fri, 22 Aug 2014 09:16:01 -0400 X-IronPort-AV: E=Sophos;i="5.04,380,1406592000"; d="scan'208";a="164151870" Message-ID: <53F7428E.90806@citrix.com> Date: Fri, 22 Aug 2014 14:15:58 +0100 From: David Vrabel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.5.0 MIME-Version: 1.0 To: Arianna Avanzini , , , , CC: , , Subject: Re: [PATCH RFC 4/4] xen, blkback: add support for multiple block rings References: <1408706404-6614-1-git-send-email-avanzini.arianna@gmail.com> <1408706404-6614-5-git-send-email-avanzini.arianna@gmail.com> In-Reply-To: <1408706404-6614-5-git-send-email-avanzini.arianna@gmail.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 22/08/14 12:20, Arianna Avanzini wrote: > This commit adds to xen-blkback the support to retrieve the block > layer API being used and the number of available hardware queues, > in case the block layer is using the multi-queue API. This commit > also lets the driver advertise the number of available hardware > queues to the frontend via XenStore, therefore allowing for actual > multiple I/O rings to be used. Does it make sense for number of queues should be dependent on the number of queues available in the underlying block device? What behaviour do we want when a domain is migrated to a host with different storage? Can you split this patch up as well? David