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Re: [Xen-users] NFS problems in guest

On 30/04/2006, at 6:03 AM, Birger Brunswiek wrote:

Itai Tavor wrote:
On 29/04/2006, at 2:05 AM, Birger Brunswiek wrote:

Itai Tavor wrote:
The symptom is that I can view the directory listing at the top level of the share, but if I try to enter any directory, or do any deep operation
on the share (like du) I get:
    ls: reading directory /mnt/test: Input/output error
    nfs: server NAS not responding, still trying

followed by a very long freeze... the NFS server doesn't show any

Can you "ping -s 1500 dumU's-ip" from dom0? If not it's probably the same
problem as I have, otherwise never mind.

Interesting... I can't ping any domain on this machine, including dom0, with a 1500 packet size - any "-s 1500" ping originating from or going
to a Xen domain fails.

I can see from your 25/4 post that you analyzed the problem already so I won't bother doing that... definitely something's wrong there. But is it
related to NFS?

Not at all. It is a fragmentation problem. Packets are defragmented by
ip_contrackt at the bridge but are then not fragmented when passed over. If I
remove that module on my machine everything is just fine.

Haha, hoho! Removing ip_conntrack eliminates the NFS problems, and great happiness ensues.

Some people might wonder why they can't use ip_conntrack and have reliable networking at the same time. Not me, though.

Thanks, Birger.

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