From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: arp during live migration Date: Wed, 07 Mar 2007 16:02:02 +0000 Message-ID: References: <342BAC0A5467384983B586A6B0B3767104DC4135@EXNA.corp.stratus.com> Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <342BAC0A5467384983B586A6B0B3767104DC4135@EXNA.corp.stratus.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Graham, Simon" , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org On 6/3/07 22:59, "Graham, Simon" wrote: > All of this leads to a ~1s delay setting up the network path plus the > gratuitous ARP is dropped so there can be a MUCH larger network > blackout. If you are trying to get sub-second blackout on migration this > is a big problem! > > It seems to me that the right thing to do here is to have the link up on > the VIF in advance of the domain resuming on the target but I'm guessing > that this would cause netback to have conniptions... Changeset 14280 in xen-unstable fixes this by no longer using the netif_carrier flag. The patch will probably backport very straightforwardly onto older (or newer) 2.6 Linux kernels. -- Keir