Re: [Xen-users] NFS problems in guest

[Itai Tavor <itai@xxxxxxxxxxxx>]

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
> > > > problems.
> > > 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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