[Xen-users] domU kernel from source capable of live migration

["William L. Thomson Jr." <wlt@xxxxxxxxxxxxxxxxxxxx>]

I have been running Xen for a while, but only recently started
attempting live migration. Which thus far has not worked for a variety
of reasons.

I am curious to know if anyone has built a domU kernel from source,
using non-distro specific sources, that is capable of live migration. I
have tried 2.6.36 and 2.3.37 sources without success. If anyone has
compiled a kernel from either of those sources and it is capable of live
migration, I would really like to see the config file. I also would not
mind seeing the config file for the dom0 as well. Might be missing some
stuff there.

I also tried xen sources 2.6.34 for the domU kernel, but for some reason
the nfs root would only come up ro and I could not get it to be rw.
Hopefully the domU kernel does not have to be built using xen sources,
for domU live migration. Probably could have live migrated that, but
with the ro vs rw issue, system wasn't really usable in a practical
sense even if it could live migrate.

Now some what unrelated I have a major problem with 2.6.37, where there
are issues with PMU. Which prevents networking from working, and the
system from mounting nfs root. This is not related to live migration,
just preventing me from trying newer sources that might be capable of
live migration. Likely a upstream issue not xen related, not sure.

On 2.6.36 I get the following for PMU
AMD PMU driver.
... version:                0
... bit width:              48
... generic registers:      4
... value mask:             0000ffffffffffff
... max period:             00007fffffffffff
... fixed-purpose events:   0
... event mask:             000000000000000f

I use the same config from 2.6.36, but in 2.6.37 and now get

Broken PMU hardware detected, software events only.

Open to any feedback, comments, suggestions etc, thanks!

-- 
William L. Thomson Jr.
Obsidian-Studios, Inc.
http://www.obsidian-studios.com


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