Re: [Xen-devel] Unstableness in grant table block drivers

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Christopher Clark wrote:

> Hello Anthony
>
> First off, hands up: this was my code and I just didn't get around to
> sending the mail to the list as I had enough to deal with relocating
> from the UK to the US last week. The code was, however, tested under
> load and working fine, and I did consider it to be ready for wider
> testing in unstable.
>  
Hi Christopher,

My note was more of a suggestion for the future than a complaint.  You 
guys in Cambridge move very quickly and it's hard for some of us outside 
to keep up :-)  You guys just keep churning out cool stuff.
> The machines you can't get to start domUs, and symptom of not finding
> the root filesystem is exactly what you'd see if your dom0 and domU
> configs don't match; either both or neither need to be using grant
> tables for transport. Your other issues will need more investigation,
> and a reproducable scenario would be extremely helpful indeed.
>  
Actually, this seems like it might be a common thread between all of our 
scenarios.  I'm using (and I assume others) a standard dom0 config file 
that has all of my hardware enabled while I just use the default config 
file for domU.
I'll try to confirm this tomorrow with the other people that were 
experiencing problems.  Perhaps I'll run a copy of fsstress too and let 
you guys know the results.
Regards,
Anthony Liguori

> Regards,
>
> Christopher
>
>
> On 4/13/05, Anthony Liguori <aliguori@xxxxxxxxxx> wrote:
>  
>
> > Ian Pratt wrote:
> >
> >    
> >
> > > OK, that's news to us - we haven't seen any problems.
> > >
> > > It's been tested with dd's and kernel builds, and wasn't expected to be
> > > a particularly dangerous change.
> > >
> > > How you confirmed that disabling the option fixes your problems? Can you
> > > give a simple recipe to provoke problems?
> > >
> > >      
> > We've had three different systems lose the ability to start domUs.
> > Disabling VBD grant tables fixed the problem.  The best reproducable
> > example we have is default config on a domU from today's xen-unstable
> > snapshot.  /dev/console is not accessible and no valid root is found.
> >
> > In my own case, it was working fairly well and then it just stopped
> > working.  It would die mid-way through boot.  Again, disabling VBD
> > grant-tables fixed the problem.  I'm going to look into the problem this
> > evening and see if I can get you guys a more reproducable scenario.
> >
> >    
> >
> > > It doesn't seem to be destablizing, at least for us. Possibly there's
> > > been some feature interaction with later checkins.
> > >
> > >
> > >      
> > Possibly.
> >
> >    
> >
> > > Anyone using the unstable tree should be reading the changelog
> > > closely...
> > >
> > >
> > >      
> > I agree.  I do, but I don't think a lot of people do.  I'm not trying to
> > give you guys more work to do :-)  Just a quick note to xen-devel would
> > suffice (if you've got an extra second).
> >
> > Thanks Ian,
> >
> > Regards,
> > Anthony Liguori
> >
> >    
> >
> > > Ian
> > >
> > >
> > >
> > >      
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> >    
>  

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