Ah Mark Mark Mark Mark,

  I just got school'ed bigtime.  I totally understand what you're saying
now, and what's going on.  Thanks for bringing me back to reality, and
sorry it took so long.

> > If the mga is so smart, I'm surprised that the XVideo driver buggers
> > it up. :(    Is this a bug do you think?
> 
> It's a feature.  Double buffering takes twice as much video memory and
> there's not much of it due to the DRI stealing it all for 3D.

  But if we can't double-buffer in the hardware then I get tearing, and
this makes it useless to a DVD player.  And you're right, my little
retrace hack doesn't help much.

  What do you recommend?

> >   Um...  According to my tests, the screen redraw only takes 0.064ms.
> 
> What is a "screen redraw"?  I thought you were using XvShmPutImage?
> That takes probably 4 or 5 ms to copy the data to framebuffer with
> that driver.

  Sorry, I needed schooling.  I understand the problem now.

  Why does it take so long to copy the data to the framebuffer?  Can't
we use DMA here?  Does it really take that long to just copy 512k?

-- 
Billy Biggs
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