From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com ([192.55.52.93]:50352 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935913AbdGTP1n (ORCPT ); Thu, 20 Jul 2017 11:27:43 -0400 Date: Thu, 20 Jul 2017 11:33:46 -0400 From: Keith Busch To: Benoit Depail Cc: Roger Pau =?iso-8859-1?Q?Monn=E9?= , xen-users@lists.xen.org, WebDawg , linux-block@vger.kernel.org Subject: Re: [Xen-users] File-based domU - Slow storage write since xen 4.8 Message-ID: <20170720153346.GC1202@localhost.localdomain> References: <5554bd39-6e0a-5c17-2b64-bb80d4a6502b@nbs-system.com> <5b562ef2-36e2-a08e-1683-6ffc7cfa54de@nbs-system.com> <20170717124931.rsiqxkzzkmvfofd7@MacBook-Pro-de-Roger.local> <5dd18982-cbcf-a675-1e07-5b4c4e4da50e@nbs-system.com> <20170717164658.drliebetcnil3wjb@dhcp-3-128.uk.xensource.com> <20170720085256.e3m35aalg6jn7qrh@dhcp-3-128.uk.xensource.com> <7205d904-44a3-631f-fbd8-8b62d43ca4e0@nbs-system.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <7205d904-44a3-631f-fbd8-8b62d43ca4e0@nbs-system.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org On Thu, Jul 20, 2017 at 05:12:33PM +0200, Benoit Depail wrote: > > The main issue we are seeing is degraded write performance on storage > devices of Xen PV DomUs, about half (or even a third on our production > setup where NFS is involved) of what we used to have. Read performance is unchanged?