2011/6/22 Zou, Nanhai <nanhai....@intel.com>: > map_gtt in current gem is super slow. > I've tried map_gtt but it seems that the speed is unacceptable. map_gtt should be pretty fast for large things on the upload side. For the gpu->cpu download, have you tried pread? btw, the counterpart (pwrite) also beats everything else for small uploads. Might be worth it to use that generally throughout libva.
The important thing is that you may never use the cpu mappings with these functions (for objects of similar size). Because libdrm reuses bos without checking their domain, you'll get tons of unnecessary clflush even on objects that do not get accessed through the cpu domain. -Daniel -- Daniel Vetter daniel.vet...@ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
