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Keith Whitwell wrote:

> machine.  Was the test on the same machine?  Do unichrome systems with
> agp slots exist?

Heck yes!  The K8M8x0 and PM8x0 chips, for Athlon64 and Pentium4
respectively, support AGP slots.  I think the original CLE266 is the
only one that doesn't.

> The ways to faster upload performance on unichrome would seem to be:
>    1) explore the dma work that has been done recently in the X11 driver
> and see if that can be brought over for texture uploads.
>    2) investigate the technique of uploading by pulling texture data
> into the GTT without performing any copying.
> 
> Probably (2) is what you're looking for, but there are no open-source
> examples of how to do this.  Kudos will await if you figure it out &
> implment a workable scheme - it's mainly a matter of kernel hacking, I
> don't think the hardware issues are particularly difficult.

Many kudos. ;)

> It's worth noting that the unichrome is not a radeon, and the cpu's on
> those boxes are quite constrained compared to fast P4's and Athlons. 
> This will have an effect on how far you can take this.

That's only true for the original CLE266 and, perhaps, the CN400 based
systems.
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