Re: UDP problem with virtio...

[Erik Brakkee <erik@brakkee.org>]

Stefan Hajnoczi wrote:
> On Sat, May 26, 2012 at 11:23 AM, Erik Brakkee<erik@brakkee.org>  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


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