Xvideo performance on Radeon 7500 vs Intel 915

Roland Scheidegger sroland at tungstengraphics.com
Sun Dec 3 12:52:28 PST 2006

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.
Dunno though maybe you can't really expect it to be fast enough.


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