NFS UDP mounts on RELENG_6?

[Oliver Brandmueller]

Hi.

On Fri, Dec 16, 2005 at 04:30:31PM +0100, Fabian Keil wrote:
> Oliver Brandmueller <ob at e-Gitt.NET> wrote:
> 
> > I'm experiencing problems when trying to mount NFS filesystems from a
> > RELENG_6 server (FreeBSD hudson 6.0-STABLE FreeBSD 6.0-STABLE
> >    #0: Wed Dec 14 16:59:55 CET 2005     
> >    root at hudson:/usr/obj/usr/src/sys/NFS-32-FBSD6  i386)
> > to either 5.4-STABLE or 6-STABLE clients. mounting works fine, but 
> > afterwards the access to the filesystem on the client stalls. As soon
> > as I mount the FS with a TCP mount everything works as expected.
> > 
> > The mounts worked fine on UDP when the server was 5.4-STABLE. There
> > is just a plain GigE switch involved, no firewalls or routing.
> > 
> > Anyone else experiencing those problems or having an idea?
> 
> I just copied some files (<200 MB) from a NFS Server running
> 
> FreeBSD africanqueen.local 6.0-STABLE FreeBSD 6.0-STABLE
> #5: Thu Dec 15 19:31:12 CET 2005
> fk at africanqueen.local:/usr/obj/usr/src/sys/AFRICANQUEEN i386
> 
> without problems. My client runs FreeBSD 5.4, I use GigE as well,
> but no switch.

Which kind GigE Interface do you use? I'm currently checking different 
things. I have another RELENG_6 machine where everything works fine, 
which has a slightly older system at the moment. Luckily it's still in 
the testing phase, so I'm currently updating and see if everything is 
still working after update. This one has bge interfaces (and is amd64).

The machine with the problem has em interfaces and I've got the feeling 
the problem is related to the interface. When doing a tcpdump at the 
time the mount stalls there's an interesting effect: On the client I see 
outgoing NFS requests only. The tcpdump on the server shows the incoming 
requests from the client AND outgoing answers from the server, which 
don't show up at the client then.

I have no other GigE NIC around to put into the original server and it 
will take some time to do the patching in the datacenter and set up a 
monitoring port (dunno if the switch is smart enough after all to do 
that) to sniff from an independent machine.

I'll keep you posted.

- Oliver

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