Xvideo performance on Radeon 7500 vs Intel 915
michel at tungstengraphics.com
Mon Nov 27 02:49:31 PST 2006
On Sun, 2006-11-26 at 19:00 -0500, Ken Mandelberg wrote:
> xine with -V xxmc
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 32291 km 15 0 223m 46m 28m S 53.6 6.1 0:25.60 xine
> 3954 root 16 0 197m 84m 46m R 28.3 11.1 7:37.75 Xorg
> With xv and xshm there is 0 idle. With xxmc there is about 15% idle, but
> in all three cases it drops frames (xshm is the worst).
The radeon driver doesn't support XvMC, so this is a little weird.
Probably xine falls back to another output.
> (II) RADEON(0): Will try to use DMA for Xv image transfers
Does Option "DMAForXv" "off" make any difference?
> By the way I'm using your pre-downscale patch to get around the 1536
> pixel scaling limitation (pink bar). The quality seems ok (at least on
> the notebook lcd), and I saw the HD performance problem without it.
> Also, I tried moving down to 16 bit depth from 24 and didn't see a
This all makes sense, as the bottleneck is probably the transfer from
system RAM to video RAM. Integrated chipsets actually have an advantage
Earthling Michel Dänzer | http://tungstengraphics.com
Libre software enthusiast | Debian, X and DRI developer
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