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Re: [Xen-devel] [xen-unstable test] 128240: regressions - FAIL

On Mon, 2018-10-01 at 16:35 +0100, Wei Liu wrote:
> On Mon, Oct 01, 2018 at 04:19:07PM +0100, George Dunlap wrote:
> > Wait, the migration code reads the scheduler parameters -- even if
> > these
> > have not been explicitly set by the admin -- and sends them along
> > with
> > the migration stream?  And if the remote scheduler is different,
> > the
> > migration fails?
> > 
> > That's not so good. :-)
> But one can argue that the guest is specific configured that way so
> it's
> parameters should be preserved. We normally analyse things on a case
> by
> case basis.
Sure, but then this means that, in the restore path, we should query
the scheduler which is in use on the host.

If it is the same one that we also see in the migration stream, we try
to set the parameters. If it is a different one, we skip the setparam
all together (which is basically what Juergen is suggesting later in
the thread, AFAICT).

I don't think I've ever worked on migration, but I can try to look into
fixing this (tomorrow).

<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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