I was testing following code on DRI r200:
http://www.gametutorials.com/download/Ports/OpenGL/RenderToTexture_SDL.zip
It renders one cube to 2D Texture, then renders one quad with that texture.
I wrote simple fps counter, and noticed, that results on Radeon 9100 with DRI are much worse than on GeForce2. It was about 10 frames per second on Radeon and 150 frames per second on GeForce2. In same color depth.
What is reason for it? Is glCopyTexImage2D implemented temporary, without optimizations?
I think that's just an unoptimized path.
-Brian
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