On Thu, 2007-03-15 at 21:36 +0300, malc wrote: > > Apparently the problem is that pages obtained by the call to > get_user_pages admit caching, so adding flush_dcache_range upon > dequeuing buffer in the device driver removes the artifacts. > > Even with this i still get roughly a 3x speedup compared to > grab to some buffer then copy to gart with memcpy. > > However i believe things can be improved: > 1. call glXGetMemoryOffsetMESA > 2. tell the driver to grab into "special" memory with this offset > > This should avoid the need of having to mess with get_user_pages and > caching altogether. > > Question is though, is this possible at all?
Possibly. In fact, it should be easy with a traditional AGP bridge which provides a physically linear view of the aperture to the CPU. Unfortunately, that's not the case with Apple UniNorth bridges, so is this on a Mac or a different PowerPC machine such as a Pegasos? If the former I suspect you may have to hook into the DRM or agpgart to get at the pages backing the AGP mapping. -- Earthling Michel Dänzer | http://tungstengraphics.com Libre software enthusiast | Debian, X and DRI developer ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Mesa3d-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
