Re: NFS lockups in Xen/amd64 -currentish?

[Johan Ihren <johani%johani.org@localhost>]

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Ok, so I'm back again from two weeks of travel and just to sort of  
wrap up this issue I'd like to report that

a) I tried Martin's suggestion of TCP mounts and/or smaller packets.  
No difference.

b) I was unable to use Sarton's suggestion of using a DOMU as the NFS  
server because of other constraints. But in general I agree that's  
probably the right thing regardless of my particular problem.

c) In the end I worked around my acute problems with hanging NFS  
mounts by making my DOMU images larger and just pre-populate them with  
all the stuff I usually access via NFS. That worked fine of course,  
but the underlying problem with NFS for that particular August cut of - 
current remains for me.

I will not spend more time on this but will rather bring the involved  
machines closer to -current and hope that it resolves itself.

Thanks for your responses,

Johan

On 16 Sep 2008, Martin Husemann wrote:

> On Mon, Sep 15, 2008 at 10:00:47PM +0200, Johan Ihren wrote:
> > Does anyone know of any recent NFS issues that cause hangs?
>
> Could you try if using TCP mounts help?
> Or if reducing read/write packet size to, say, 1024 helps?
>
> Martin

On 16 Sep 2008, Sarton O'Brien wrote:

> On Tuesday 16 September 2008 06:00:47 Johan Ihren wrote:
> > Hi,
> >
> > In a Xen environment where I run an amd64 DOM0 with either amd64 or
> > i386pae DOMUs I ran into the problem that amd64 DOMUs could not NFS
> > mount anything from the DOM0. As soon as they touched NFS they hang
> > hard. Now, I know that NFS problems tend to make things hang, and it
> > is sometimes hard to distinguish between "hang" as in "kernel is  
> > hung"
> > or as in "kernel is waiting for something".
>
> This may not help any but I have run into similar issues whenever I  
> run
> certain services on dom0. Running the same service from a domu and  
> working in
> reverse has always worked.
>
> It all started for me when I noticed my dom0 couldn't see broadcast  
> packets
> and therefore wouldn't respond to broadcast queries. I didn't bother  
> going any
> further and the interest was limited.
>
> I didn't like moving these services to a domu as they were central but
> admittedly it has helped prevent the dom0 from panicing as  
> regularly ;)
>
> Sarton
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