From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Brakkee Subject: Re: UDP problem with virtio... Date: Wed, 30 May 2012 11:48:52 +0200 Message-ID: <4FC5ED04.6030906@brakkee.org> References: <4FBFF1C9.2030606@brakkee.org> <4FC0AF2E.5030506@brakkee.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: KVM list To: unlisted-recipients:; (no To-header on input) Return-path: Received: from smtp-vbr1.xs4all.nl ([194.109.24.21]:4826 "EHLO smtp-vbr1.xs4all.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751172Ab2E3Js7 (ORCPT ); Wed, 30 May 2012 05:48:59 -0400 Received: from brakkee.org (a83-163-128-75.adsl.xs4all.nl [83.163.128.75]) by smtp-vbr1.xs4all.nl (8.13.8/8.13.8) with SMTP id q4U9muSD022131 for ; Wed, 30 May 2012 11:48:57 +0200 (CEST) (envelope-from erik@brakkee.org) Received: from pelican.lan (pelican.fritz.box [192.168.178.30]) by brakkee.org (Postfix) with ESMTP id E4BCB6528D for ; Wed, 30 May 2012 11:48:47 +0200 (CEST) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: Stefan Hajnoczi wrote: > On Sat, May 26, 2012 at 11:23 AM, Erik Brakkee wrote: >> I have done some more experiments and it does work when using a Centos 6.2 >> guest. Therefore, it is most likely a compatibility issues between the guest >> and host virtio implementation. >> I read somewhere there is some sort of compatibility mode for virtio but >> could not find how to activate it. Is there a way to make these different >> virtio host/guest implementations talk to each other? > They should be compatible. > > I noticed in your domain XML the VM has two virtio-net interfaces. > Could that be affecting your mount success? > > Did you collect a packet capture inside the guest? (tcpdump -nli eth0 > -s0 -w /tmp/dump.pcap) > > It would be interesting to understand what the guest sees during the > failed and successful UDP NFS mounts. > > Can you be more specific about the mount failure. Is there an error > message? Anything interesting in the guest's dmesg? > > Did you collect a packet capture on the host? > > Stefan Hi all, I sent a reply earlier but apparently not to this mailing list. The problem went away after installing the latest software updates on the openSuSE 11.3 guest. I tried reproducing it from a backup of the VM running the older kernel but was unable to do this on a openSuSE 12.1 host. To reproduce it I would have had to use the centos 6.2 host but that would be quite a lot more work to do. So I am leaving the issue now as resolved. It was probably some earlier bug that was fixed. Cheers Erik -- Nonsense and other useful things: http://brakkee.org MountainHoppers: http://mountainhoppers.nl Track Detective: http://trackdetective.com Twitter: http://twitter.com/ErikBrakkee