[Bug 612671] Re: Live Migration Guest Network Stops Responding

[Moshe Ortov]

Further experimentation on this from building a brand new XP SP2 VM then
upgrading it to SP3 and performing migrations seems to be a little
better, but not perfect.

A migration from node 1 to node 2 (in any order) works for the 1st
migration.  If a 2nd migration is tried then when it arrives at the back
at the original node (i.e. node 1 -> node 2 -> node1) the VM is frozen
(hung).  CPU usage for the VM process is pegged at 100%.

I tried switching the CPU emulation to i686 from x86_64 - this was based
on a posting about XP VMs locking up but that does not seem to have made
any difference.

However, if I have a 'long' delay between migrations (> 30 minutes in
what I tried) the migration back /does/ seem to work.  This has happened
a couple of times, but I've not found out how long the VM needs to be on
node 2 before it can successfully migrate back to node 1 (i.e. I tried
30 minutes but that was not specifically chosen as a time to wait).

I'm not sure if the wait works in absolutely every case - I'll need to
try more experiments.  If there are any suggestions on what I can do to
help get the cause identified & fixed, let me know.

-- 
Live Migration Guest Network Stops Responding
https://bugs.launchpad.net/bugs/612671
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