Re: High X server CPU usage when drawing - more info

Dr Andrew C Aitchison wrote:
> Sometimes pixmaps are stored in offscreen video memory, sometimes
> in system memory. Maybe you are resizing your window such that the pixmaps
> don't fit in video memory so the server puts some in system memory.
> Under ideal conditions copying from video -> video requires no CPU
> overhead, but system -> video copies can require CPU effort.
> 
> The X server logfile often gives clues about how much video memory
> is available for pixmaps.

The server log only reports 'Offscreen Pixmaps' in the accelerated 
features of our G450 Matrox cards, although I'm not sure what it means. 
Your explanation for the slow down makes sense, however, i've reproduced 
this problem even with a card with 32 MB of memory.

-- 
      Rafael