From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:36303) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UQJjM-0006qI-P2 for qemu-devel@nongnu.org; Thu, 11 Apr 2013 11:48:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UQJjL-0003dy-M3 for qemu-devel@nongnu.org; Thu, 11 Apr 2013 11:48:08 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32832) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UQJjL-0003do-F9 for qemu-devel@nongnu.org; Thu, 11 Apr 2013 11:48:07 -0400 Message-ID: <5166DAA0.1010507@redhat.com> Date: Thu, 11 Apr 2013 17:45:36 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1365632901-15470-1-git-send-email-mrhines@linux.vnet.ibm.com> <1365632901-15470-11-git-send-email-mrhines@linux.vnet.ibm.com> <20130411073843.GB19601@redhat.com> <51667FEE.903@redhat.com> <5166B9A9.9070904@linux.vnet.ibm.com> <5166C59A.4010904@redhat.com> <5166CF56.2060105@linux.vnet.ibm.com> <5166D1DA.3050804@redhat.com> <5166D826.207@linux.vnet.ibm.com> In-Reply-To: <5166D826.207@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC PATCH RDMA support v1: 10/13] introduce new command migrate_check_for_zero List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael R. Hines" Cc: aliguori@us.ibm.com, "Michael S. Tsirkin" , qemu-devel@nongnu.org, owasserm@redhat.com, abali@us.ibm.com, mrhines@us.ibm.com, gokul@us.ibm.com Il 11/04/2013 17:35, Michael R. Hines ha scritto: > Nevertheless, the initial "burst" of the bulk phase round is still > important to optimize, and I would like to know if the maintainer > would accept this API for disabling the scan or not I'm not a maintainer, but every opinion counts... and my opinion is "not yet". Maybe for 1.6, and only after someone else tried it out. That's why it's important to merge the code early. > We think it's important because the total migration time can be much > smaller with high-throughput RDMA links by optimizing the bulk-phase > round and that lower total migration time is very valuable to many of > our workloads, in addition to the low-downtime benefits you get with > RDMA. > > I have expensive numbers only for the bulk phase round. Other than that, > I would be breaking confidentiality outside of the paper we have already > published. Fair enough. Paolo