Re: Unstableness in grant table block drivers

[Christopher Clark <christopher.w.clark@gmail.com>]

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.

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.

Regards,

Christopher


On 4/13/05, Anthony Liguori <aliguori@us.ibm.com> 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
> >
> >
> >
> 
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