From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [Qemu-devel] [Bug 1100843] Re: Live Migration Causes Performance Issues Date: Mon, 07 Oct 2013 11:37:11 +0200 Message-ID: <525280C7.2050402@redhat.com> References: <20130117163740.7157.55600.malonedeb@gac.canonical.com> <20130926203354.30826.10562.malone@soybean.canonical.com> <52516C4A.6080508@gmail.com> <525256FC.6060608@dlhnet.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Zhang Haoyu , Bug 1100843 <1100843@bugs.launchpad.net>, gleb@redhat.com, eblake@redhat.com, quintela@redhat.com, afaerber@suse.de, xiaoguangrong@linux.vnet.ibm.com, mtosatti@redhat.com, kvm@vger.kernel.org, mst@redhat.com, qemu-devel To: Peter Lieven Return-path: Received: from mx1.redhat.com ([209.132.183.28]:50720 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753697Ab3JGJh1 (ORCPT ); Mon, 7 Oct 2013 05:37:27 -0400 In-Reply-To: <525256FC.6060608@dlhnet.de> Sender: kvm-owner@vger.kernel.org List-ID: Il 07/10/2013 08:38, Peter Lieven ha scritto: > On 06.10.2013 15:57, Zhang Haoyu wrote: >>> >From my testing this has been fixed in the saucy version (1.5.0) of >> qemu. It is fixed by this patch: >>> f1c72795af573b24a7da5eb52375c9aba8a37972 >>> >>> However later in the history this commit was reverted, and again broke >> this. The other commit that fixes this is: >>> 211ea74022f51164a7729030b28eec90b6c99a08 >>> >> See below post,please. >> https://lists.gnu.org/archive/html/qemu-devel/2013-08/msg05062.html > > I would still like to fix qemu to not load roms etc. if we set up a > migration target. In this case > we could drop the madvise, skip the checking for zero pages and also > could avoid sending > zero pages at all. It would be the cleanest solution. It's in general not easy to do this if you take non-x86 targets into account. Paolo