From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:50531) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1USUoo-0004TG-TA for qemu-devel@nongnu.org; Wed, 17 Apr 2013 12:02:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1USUoj-0007S1-LK for qemu-devel@nongnu.org; Wed, 17 Apr 2013 12:02:46 -0400 Received: from e8.ny.us.ibm.com ([32.97.182.138]:42955) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1USUoj-0007Ru-HR for qemu-devel@nongnu.org; Wed, 17 Apr 2013 12:02:41 -0400 Received: from /spool/local by e8.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 17 Apr 2013 12:02:41 -0400 Received: from d01relay03.pok.ibm.com (d01relay03.pok.ibm.com [9.56.227.235]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id 758B838C8051 for ; Wed, 17 Apr 2013 12:02:37 -0400 (EDT) Received: from d01av05.pok.ibm.com (d01av05.pok.ibm.com [9.56.224.195]) by d01relay03.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3HG2blZ280032 for ; Wed, 17 Apr 2013 12:02:37 -0400 Received: from d01av05.pok.ibm.com (loopback [127.0.0.1]) by d01av05.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r3HG2af0019177 for ; Wed, 17 Apr 2013 12:02:36 -0400 Message-ID: <516EC75D.6050808@linux.vnet.ibm.com> Date: Wed, 17 Apr 2013 12:01:33 -0400 From: "Michael R. Hines" MIME-Version: 1.0 References: <1366172418-8729-1-git-send-email-mrhines@linux.vnet.ibm.com> <1366172418-8729-8-git-send-email-mrhines@linux.vnet.ibm.com> <516EC54E.10008@redhat.com> In-Reply-To: <516EC54E.10008@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PULL v3 7/7] rdma: add documentation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Eric Blake Cc: aliguori@us.ibm.com, quintela@redhat.com, mst@redhat.com, qemu-devel@nongnu.org, owasserm@redhat.com, abali@us.ibm.com, mrhines@us.ibm.com, gokul@us.ibm.com, pbonzini@redhat.com On 04/17/2013 11:52 AM, Eric Blake wrote: > On 04/16/2013 10:20 PM, mrhines@linux.vnet.ibm.com wrote: > >> +Experimental: Next, decide if you want dynamic page registration. >> +For example, if you have an 8GB RAM virtual machine, but only 1GB >> +is in active use, then disabling this feature will cause all 8GB to >> +be pinned and resident in memory. This feature mostly affects the >> +bulk-phase round of the migration and can be disabled for extremely >> +high-performance RDMA hardware using the following command: >> + >> +QEMU Monitor Command: >> +$ migrate_set_capability chunk_register_destination off # enabled by default > This needs updating to match the QMP capability name (or else the HMP > command needs some glue logic to map chunk_register_destination into the > QMP x-chunk-register-destination as a convenience to the user). > >> + >> +TODO: >> +===== >> +1. Currently, cgroups swap limits and infinband memory pinning >> + are not compatible with each other. We have no plans to unregister >> + memory *during* the live migration as the benefit of doing so is not clear. >> +2. Use of the recent /proc//pagemap would likely speed up >> + the use of KSM and ballooning while using RDMA. >> +3. Also, some form of balloon-device usage tracking would also >> + help alleviate some issues. > Maybe also mention that the protocol will be renamed from -incoming > x-rdma:... to -incoming rdma:... when it has been through more testing > to stabilize the protocol. > Acknowledged. Thanks for the catch.