From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39050) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VT4T8-0005Xn-Hv for qemu-devel@nongnu.org; Mon, 07 Oct 2013 02:39:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VT4T1-0000DF-Oc for qemu-devel@nongnu.org; Mon, 07 Oct 2013 02:39:02 -0400 Received: from ssl.dlhnet.de ([91.198.192.8]:56558 helo=ssl.dlh.net) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VT4T1-0000Cq-II for qemu-devel@nongnu.org; Mon, 07 Oct 2013 02:38:55 -0400 Message-ID: <525256FC.6060608@dlhnet.de> Date: Mon, 07 Oct 2013 08:38:52 +0200 From: Peter Lieven MIME-Version: 1.0 References: <20130117163740.7157.55600.malonedeb@gac.canonical.com> <20130926203354.30826.10562.malone@soybean.canonical.com> <52516C4A.6080508@gmail.com> In-Reply-To: <52516C4A.6080508@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [Bug 1100843] Re: Live Migration Causes Performance Issues List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhang Haoyu , Bug 1100843 <1100843@bugs.launchpad.net>, gleb@redhat.com, eblake@redhat.com, quintela@redhat.com, pbonzini@redhat.com, afaerber@suse.de, xiaoguangrong@linux.vnet.ibm.com, mtosatti@redhat.com, kvm@vger.kernel.org, mst@redhat.com Cc: qemu-devel 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. Peter