[Spice-devel] xf86-video-qxl performance

[Yaniv Kaul]

----- Original Message -----
> I need to improve the performance of the xf86-video-qxl driver; aka
> xspice; by a fairly substantial margin.

What performance characteristic would you like to improve?
1. Performance over WAN (high latency and/or low bandwidth) ?
2. CPU usage (on the server and/or the client and/or the guest) ?
3. Other?

I suggest trying to figure out what is it that you wish to 'attack' first.
Some of the decisions taken during the development of Spice certainly did not take into account WAN conditions, for example.
It was initially mostly concerned with providing physical-like experience, on decent servers and clients over LAN.

> 
> I've set up a test case - LibreOffice over an 80 ms latency
> connection -
> that demonstrates that it's got quite a long way to go.  (The current
> case appears to suffer from an excessive set of draw fill
> operations).

Sounds familiar - I've seen it in a case where I expected to see a video stream sent instead.
Not sure what is more efficient, though.
Y.

> 
> Has any work been done on the 'Current plan' listed in the TODO?
> Can I help in any way?
> 
> Also, as a crazy idea, has anyone considered implementing a pure
> streaming video driver?  That is, what if we had a frame buffer
> driver,
> and then a thread that fired 29 times a second to drive a theora or
> vp8
> encoder, simply feeding the current frame at those intervals.
> 
> The advantage to that crazy proposal is that it would likely make the
> pure html5 client work 'perfectly'.  The obvious disadvantage is that
> it
> would consume a lot more cpu resources on the host, although it's not
> clear to me how substantial that would be.
> 
> Thoughts?
> 
> Cheers,
> 
> Jeremy
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