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Re: [Xen-devel] RTDS with extra time issue

On Fri, Feb 9, 2018 at 10:18 AM, Dario Faggioli <dfaggioli@xxxxxxxx> wrote:
> On Fri, 2018-02-09 at 17:03 +0200, Andrii Anisov wrote:
> > > If DomR is not able to get its share, then we have an issue/bug in
> > > the
> > > scheduler. If it does, then the scheduler is doing its job, and the
> > > issue may be somewhere else (e.g., something inside the guest may
> > > eat
> > > some of the budget, in such a way that not all of it is available
> > > when
> > > you actually need it).
> >
> > The DomR guest is really lean, I already shown processes list in it.
> > I
> > really doubt init together with getty on HVC can eat another 10% of
> > CPU
> > at any moment.
> >
> So, I'm a little bit in a hurry now, and I'll reply better later (or on
> Monday). But for now, just to understand things better, can you enable
> extratime for DomR as well, and report what you see in xentop, and
> whether or not you still see deadline misses?

Another way to check if there is interference from services in domR is
to set period = budget for the domR's VCPUs.

Best Regards,


Meng Xu
Ph.D. Candidate in Computer and Information Science
University of Pennsylvania

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