On 01/16/2013 06:26 PM, Carsten Haitzler (The Rasterman) wrote:
> you almost definitely will have to chase this up with your driver vendors.
>
> 1. compositing with SOFTWARE works smoothly (well 20-60fps)  on a 600mhz
> penitum-m.
 > 2. it works "usably" on even lower end arm machines.. *IN SOFTWARE*

Hmmm, this is not my experience on a 1.8Ghz dual-core athlon.  With 
software rendering, I get noticeable visual stutter when switching 
virtual desktops.  Dense text, webpages, and lots of windows on a 
desktop make it worse.  Video tears pervasively.  Flash video, not so 
hot to being with, is totally unusable.

Should I expect better?  Perhaps I need to tweak some other settings or 
compile differently?  I just assumed that it was expected that software 
would be not so great.

> 3. if you use gl accel... then it should be rather smooth - but now it's a
> driver problem. we can't fix your drivers. i doubt it's composite's fault - 
> its
> most likely driver/gl. ALL composite does is redirect rendering from the real
> framebuffer with cliplists to a pixmap without cliplists, as well as issuing
> damage events for updates to those pixmaps.

Sure - drivers and their varying quality is a problem.  Frustratingly, 
the GPU in my PC (RS880) is one of the few that the wiki lists as tested 
and working.  I do recognize that its working once with certain versions 
of the Xorg stack means relatively little.

Ross


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