Re: [Xen-devel] Xen optimization

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>]

On Fri, 26 Oct 2018, Julien Grall wrote:
> 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?

Yes, I intend to, it is on my TODO.

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