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I started switching a system which had been primarily a low-volume
nameserver/mail relay to being a xen host a couple days ago, and it's
now hung overnight two nights in a row.

The setup is a dom0 (still performing the dns/mail relay, since I
haven't migrated it yet) running a -current kernel of a couple days ago
on a 3.0_STABLE userland.  The domU is still doing little (I'm setting
it up as a web server, but no real traffic yet).  What happened last
night is that a "top" running in the domU hung at about 03:19, but
there's evidence that the dom0 was doing _some_ processing until 07:00,
although at that time it wouldn't respond on console.  (As an aside, I'm
unable to get dom0 into ddb - the machine has a serial console, if that
matters)

After a few minutes of poking around, I did the ^A^A^A thing to switch
to the Xen console, and rebooted.

A few other details:

- the nightly cron jobs on the two "machines" run at the same time - I
haven't tweaked that yet.
- the domU's disk is provided by two files in the filesystem of the dom0
- the dom0 has 192M of RAM, the domU 128M.  The physical machine has two
CPUs (PIII-1GHz) and 1G RAM


Any thoughts about what might be happening, how I can troubleshoot,
and/or how I can fix this?  I'd hate to lose the ability to run multiple
VMs on this machine...

Thanks,
+j



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