[Bug 5876] big xvideo issues with ATI Radeon RV100 family (Mobility M6 LY, ...)

[bugzilla-daemon at annarchy.freedesktop.org]

Please do not reply to this email: if you want to comment on the bug, go to    
       
the URL shown below and enter yourcomments there.     
   
https://bugs.freedesktop.org/show_bug.cgi?id=5876          
     




------- Additional Comments From michel at tungstengraphics.com  2006-12-05 03:10 -------
(In reply to comment #23)
> The likely reason being that X won't consume cpu cycles during the usleep,
> otherwise it probably would have had to wait for RADEONWaitForFIFO anyway
> since the gpu is still busy uploading the data

BTW, most if not all of these RADEONWaitForFIFO() calls are probably bogus. I
doubt the overlay registers go through the FIFO, but even if they do,
RADEONWaitForFIFO() is useless while the CP is busy, as it would likely fill up
any available FIFO slots anyway.

> And I was wrong assuming you could still get 200fps even with those pll erratas.
> INPLL causes this wait just as well, so the max would be 100fps.

That's assuming the delays are accurate... which I suspect is rather unlikely,
although in both directions due to scheduling latency and signals.          
     
     
--           
Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email         
     
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.