Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751948Ab2FSKOa (ORCPT ); Tue, 19 Jun 2012 06:14:30 -0400 Received: from mail-lb0-f174.google.com ([209.85.217.174]:47614 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751207Ab2FSKO2 convert rfc822-to-8bit (ORCPT ); Tue, 19 Jun 2012 06:14:28 -0400 MIME-Version: 1.0 In-Reply-To: <4FDFFEF8.9000609@redhat.com> References: <1340002390-3950-1-git-send-email-asias@redhat.com> <4FDEF73E.3010501@redhat.com> <4FDFFEF8.9000609@redhat.com> Date: Tue, 19 Jun 2012 11:14:26 +0100 Message-ID: Subject: Re: [PATCH v2 0/3] Improve virtio-blk performance From: Stefan Hajnoczi To: Asias He Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1110 Lines: 28 On Tue, Jun 19, 2012 at 5:24 AM, Asias He wrote: > On 06/18/2012 06:58 PM, Stefan Hajnoczi wrote: >> >> As long as the latency is decreasing that's good. ?But It's worth >> keeping in mind that these percentages are probably wildly different >> on real storage devices and/or qemu-kvm. ?What we don't know here is >> whether this bottleneck matters in real environments - results with >> real storage and with qemu-kvm would be interesting. > > > Yes. Here is the performance data on a Fusion-IO SSD device. > > Fio test is performed in a 8 vcpu guest with Fusion-IO based guest using kvm > tool. > > ? ?Short version: > ? ? With bio-based IO path, sequential read/write, random read/write > ? ? IOPS boost ? ? ? ? : 11%, 11%, 13%, 10% > ? ? Latency improvement: 10%, 10%, 12%, 10% Nice, I'm glad the improvement shows on real hardware. Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/