Re: [Xen-devel] RT-Xen on ARM

[Andrii Anisov <andrii_anisov@xxxxxxxx>]

Hello Dario,


On 28.09.17 19:01, Dario Faggioli wrote:
> On Thu, 2017-09-28 at 12:18 +0300, Andrii Anisov wrote:
> > > >       - Could you please provide an example input xml for CARTS
> > > > described a
> > > > system with 2 RT domains with 2 VCPUs each, running on a 2PCPUs,
> > > > with gEDF
> > > > scheduling at VMM level (for XEN based setup).
> > > Hmm, if you use the gEDF scheduling algorithm, this may not be
> > > possible. Let me explain why.
> > > In the MPR2 model, it computes the interface with the minimum
> > > number
> > > of cores. To get 2 VCPUs for a VM, the total utilization (i.e.,
> > > budget
> > > / period) of these two VCPUs must be larger than 1.0. Since you ask
> > > for 2 domains, the total utilization of these 4 VCPUs will be
> > > larger
> > > than 2.0, which are definitely not schedulable on two cores.
> > Well, if we are speaking about test-cases similar to described in
> > [1],
> Missing the link?
Yep, I've missed the link.

[1] https://www.cis.upenn.edu/~linhphan/papers/emsoft14-rt-xen.pdf

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*Andrii Anisov*

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