From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58966) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XQ1mZ-0001BK-6j for qemu-devel@nongnu.org; Fri, 05 Sep 2014 18:15:12 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XQ1mQ-0002Ru-4U for qemu-devel@nongnu.org; Fri, 05 Sep 2014 18:15:03 -0400 Received: from mail-wg0-x22f.google.com ([2a00:1450:400c:c00::22f]:42945) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XQ1mP-0002Rl-U2 for qemu-devel@nongnu.org; Fri, 05 Sep 2014 18:14:54 -0400 Received: by mail-wg0-f47.google.com with SMTP id z12so12392499wgg.30 for ; Fri, 05 Sep 2014 15:14:53 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <540A35D5.4050708@redhat.com> Date: Sat, 06 Sep 2014 00:14:45 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <20140905135244.104423770@amt.cnet> <20140905182656.GA16828@amt.cnet> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [patch 0/3] kvmclock: Ensure time in migration never goes backward (v3) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Andrey Korolyov , Marcelo Tosatti Cc: =?UTF-8?B?TWFyY2luIEdpYnXDhSBh?= , "qemu-devel@nongnu.org" Il 05/09/2014 21:35, Andrey Korolyov ha scritto: > - boot up a VM, make sure to feed it heavy long task, for example > kernel compilation, > - neither migrate once in the middle of process (with fallback to > non-live migration which is available in libvirt, else it may take > forever) or just wait up to the end, > - live migration time degrades from sub-10s value to larger values > forever, not regarding if workload is still presented or not. Are you sure you aren't simply doing migration with a low bandwidth limit (the default is 32 MB/s), and moving over a gigabyte worth of page cache data to the new machine? Paolo