Re: [Xen-devel] Xen optimization

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>]

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.

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