Xvideo performance on Radeon 7500 vs Intel 915

[Michel Dänzer]

On Sun, 2006-12-03 at 21:52 +0100, Roland Scheidegger wrote:
> Ken Mandelberg wrote:
> > After:
> >    mplayer: user: 124sec sys:  3secs  real:198
> >    Xorg:    user:  34sec sys: 32secs
> > 
> > So unless there is a statistical anomaly here, it seems to have reduced 
> > the user space cpu time of Xorg by about 30%.
> > 
> > Still it doesn't perform well enough to use except in a pinch because of 
> > frame drops (about 30%) . I guess the hardware is just not up to the 
> > task for HD, especially 1080i.
> > 
> > For comparison with my Intel 915-Pentium M (2GHZ) on the same clip
> > 
> >    mplayer: user: 116sec sys:  3secs  real:249
> >    Xorg:    user:  2sec sys:   0secs
> 
> I think the dropped X cpu usage is about right for the patch, but there 
> still seems to be some problem. While a p4-m might be borderline fast 
> enough, and you can't expect X cpu time to be as low as on the i915, x 
> cpu usage looks quite high (if using dri (dma for xv)). You didn't say 
> if you tried increasing agp mode, though it shouldn't really make a 
> difference. Especially x.org system cpu time looks high, what is it 
> waiting for there.

sysprof or oprofile should tell, but my first guess would be for
indirect buffers for the upload.


-- 
Earthling Michel Dänzer           |          http://tungstengraphics.com
Libre software enthusiast         |          Debian, X and DRI developer