[Spice-devel] Is there a good way to estimate the latency of spice?

[Victor Toso]

Hi,

On Thu, Apr 14, 2022 at 05:08:47PM +0800, Walter Mitty wrote:
> Hello everyone,
> During my experience of SPICE, I feel it is not fluent. So I
> wanna know the latency about interactivity and rendering. From
> my understanding, It may be the time from the moment draging an
> app-window to the moment that client rendering changes.
> Any suggestions will be appreciated.

Are you using video streaming settings?

In the demo below, we used a GTK's environment variable to show
what was being rendered in the client-side when an update was
done in the guest:
    
    https://www.youtube.com/watch?v=VUQYs72hrbM&t=612s

Sending only the diff of updates worked pretty well in the past,
but it doesn't with Desktop Environments moving forward to 3D
rendering.

So, if you latency is about that, you can try to optimize by
setting 3d rending off in the guest. Video streaming helps a bit
with chopping videos and overall data bandwidth but it adds
further latency due software encoding on the server side.

> Regards,
> Walter.

I hope this helps, let me know if you have further questions.

Cheers,
Victor
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