Composite really slow

[Dave Airlie]

> 
> It's all open source.  Someone just needs to find the time to port KAA
> and the related driver bits to xorg.  Unfortunately, it's not a
> trivial task.
> 

This may be a stupid question and let me clarify I've no idea about
XAA or KAA and have never looked at either of them, but can XAA not be
extended (incompatilbity maybe?) to be better at doing
render/composite stuff, I don't like the idea of rewriting drivers
just because some interface is not up to the job....

Dave.