From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: QEMU P2P migration speed Date: Wed, 05 Feb 2014 16:15:21 +0100 Message-ID: <52F25589.50503@redhat.com> References: <52F11E1C.8060608@xdel.ru> <52F1E7E1.5040607@redhat.com> <52F2169D.9080806@xdel.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: Andrey Korolyov , kvm@vger.kernel.org Return-path: Received: from mail-qa0-f49.google.com ([209.85.216.49]:62510 "EHLO mail-qa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752756AbaBEPP0 (ORCPT ); Wed, 5 Feb 2014 10:15:26 -0500 Received: by mail-qa0-f49.google.com with SMTP id w8so702749qac.22 for ; Wed, 05 Feb 2014 07:15:26 -0800 (PST) In-Reply-To: <52F2169D.9080806@xdel.ru> Sender: kvm-owner@vger.kernel.org List-ID: Il 05/02/2014 11:46, Andrey Korolyov ha scritto: > On 02/05/2014 11:27 AM, Paolo Bonzini wrote: >> Il 04/02/2014 18:06, Andrey Korolyov ha scritto: >>> Migration time is almost independent of VM RSS(varies by ten percent at >>> maximum), for situation when VM is active on target host, time is about >>> 85 seconds to migrate 8G between hosts, and when it is turned off, >>> migration time *increasing* to 120s. For curious ones, frequency >>> management is completely inactive on both nodes, neither CStates >>> mechanism. Interconnection is relatively fast (20+Gbit/s by IPoIB). >> >> What version of QEMU? >> >> Paolo > > Ancie.. ehm, stable - 1.1.2 from wheezy. Should I try 1.6/1.7? Yeah, you can checkout the release notes on wiki.qemu.org to find out which versions had good improvements. You can also try compiling straight from git, there are more speedups there. Paolo