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

To: "William L. Thomson Jr." <wlt@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] domU kernel from source capable of live migration
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 23 Feb 2011 10:27:09 +0200
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On Mon, Feb 21, 2011 at 12:50:26PM -0500, William L. Thomson Jr. wrote:
> 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.

Did you try exactly and ?
Later updates to those have many bugfixes.

> 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.

I'd recommend you to try aswell.

> 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!

What kernel cmdline options are you using? 
You should have "console=hvc0 earlyprintk=xen" at least.

-- Pasi

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