On Mon, 2016-12-05 at 11:51 -0800, Stefano Stabellini wrote:
> Another approach is to let the scheduler know that migration is
> slower.
> In fact this is not a new problem: it can be slow to migrate
> interrupts,
> even few non-LPIs interrupts, even on x86. I wonder if the Xen
> scheduler
> has any knowledge of that (CC'ing George and Dario). I guess that's
> the
> reason why most people run with dom0_vcpus_pin.
>
Oh, and about this last sentence.

I may indeed be lacking knowledge/understanding, but if you think this
is a valid use case for dom0_vcpus_pin, I'd indeed be interested in
knowing why.

In fact, that configuration has always looked rather awkward to me, and
I think we should start thinking stopping providing the option at all
(or changing/extending its behavior).

So, if you think you need it, please spell that out, and let's see if
there are better ways to achieve the same. :-)

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)