Re: CPU and GPU cache-coherence

[Michel D. <mi...@da...>]

On Die, 2011-06-07 at 21:42 +0800, Donnie Fang wrote:
> 3D render image on WC AGP aperture BO and then CPU fetch the image
> from this bo, in order to achieve performance, after 3D finished
> rendering, validate this bo into cached system memory and then read it
> from system memory. But I always get garbage from there.
> After check TTM bo validate codes, it has dealt with cache coherence
> properly, i wonder whether there is something I misunderstand or it is
> not allowed to move the WC bo from AGP to system memory for reading?

Can you post patches showing what you've tried?


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