Re: [Xen-devel] Xen optimization

[Julien Grall <julien.grall@xxxxxxx>]

Hi Stefano,

On 10/25/18 5:15 PM, Stefano Stabellini wrote:
> On Thu, 25 Oct 2018, Julien Grall wrote:
> > Hi Stefano,
> >
> > On 10/24/18 1:24 AM, Stefano Stabellini wrote:
> > > On Tue, 23 Oct 2018, Milan Boberic wrote:
> > > I don't have any other things to suggest right now. You should be able
> > > to measure an overall 2.5us IRQ latency (if the interrupt rate is not
> > > too high).
> > Is it number you measured on Xen 4.11 flavored Xilinx? Or are they coming from
> > the blog post [1] which is based on Xen 4.9?
> >
> > If the latter, then I can't rule out we may have introduce a slowdown for good
> > or bad reason...
> >
> > To rule out this possibility, I would recommend to try and reproduce the same
> > number on Xen 4.9 and then try with Xen 4.11.
> >
> > Cheers,
> >
> > [1] https://blog.xenproject.org/2017/03/20/xen-on-arm-interrupt-latency/
> I was talking about the old numbers from Xen 4.9. You are right, we
> cannot rule out the possibility that we introduced a slowdown.
Can you try to reproduce those number with your setup on Xen 4.11?

Cheers,

--
Julien Grall

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