Could someone deliver some facts about this patch?
Any speed ups in some games? Is it noticeable?
Unfortunately my self built kernel 3.8 from git isn't working well here, I'm getting random segfaults from various programmes.
I expect a small performance improvement in CPU-bound apps, because copying buffers using the CP DMA instead of streamout (=OpenGL transform feedback, we have been using it up to now) takes less space in the command stream, doesn't change any 3D states, and doesn't need any other resources (streamout needs an auxiliary buffer where the FILLED_SIZE register is stored). Also streamout requires 4-byte alignment. The CP DMA doesn't have that limitation.
Last edited by marek; 01-09-2013 at 08:00 PM.