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Re: [Xen-devel] [PATCH v10 09/11] x86/ctxt: Issue a speculation barrier between vcpu contexts

On Fri, 2018-01-26 at 02:43 -0700, Jan Beulich wrote:
> > > > On 26.01.18 at 02:08, <dfaggioli@xxxxxxxx> wrote:
> > And in order to go and investigate this a bit further, Jan, what is
> > it
> > that you were doing when you saw what you described above? AFAIUI,
> > that's booting an HVM guest, isn't it?
> Yes, plus then run some arbitrary work inside it.
Ok. And you've seen the "spurious" migrations only/mostly during boot,
or even afterwords, while running this work?

> > How many vCPUs on how many pCPUs? Basically, I would just need a
> > confirmation that the system was not oversubscribed, but if, while
> > we're here, you can tell me the details, I'll put together an as
> > much
> > as possible similar scenario.
> 12 pCPU-s, HVM guest has 8 vCPU-s, Dom0 has 12 pCPU-s (but
> no other load than that caused by the guest). 

> If you want, I could
> bring the code I've used for monitoring into patch form and hand
> it to you.
If it's not a problem, and whenever you have time, yes, that would be
useful, I think.

Thanks and Regards,
<<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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