Re: Xvideo acceleration: GATOS for PPC?

Hi Michel,

Michel D�nzer wrote:

quoted

quoted

Although I found no evidence documented evicende of this, I suppose this
is because XFree (plain), although implementing Xvideo, doesn't use the
hardware acceleration in the ATI chips, whereas the GATOS drivers do
just that.

Not quite. Plain XFree86 uses the frontend scaler, which also does the
colorspace conversion. The reason for the CPU load is that the data is
transferred to the card with regular memcpy. If the GATOS drivers use
(virtually) no CPU for the transfer, that hints at that they use bus
mastering for the transfer. Very interesting, I'll have to look at the code.

False alarm, they also use memcpy. In fact, the code looks very similar to
plain XFree86, so I'd be surprised if it makes any difference.

Did you look at the r128 driver only? My test showing the decrease in CPU load
was on a Rage Mobility-equipped Dell laptop (i.e Mach64-compatible using the ati
driver).

Anyway, Tonight I'll try the r128 on PPC and report back...

Cheers

Michel
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