Kernel scheduling algorithm and X.Org performance

[Benjamin Herrenschmidt]

> Aqua's window model is almost exactly like X's model under Composite.  All 
> windows are rendered to offscreen surfaces and the actual rendering process 
> is governed by a compmgr.  They don't have a window hierarchy so they have it 
> a little simpler.

Yes, but the rendering inside the offscreen surface is done by the
server or by direct rendering from the application context ? Carbon
QuickDraw direct renders in the offscreen afaik, not sure about more
advanced stuff.