On 2011-02-03 12:04, Gilles Chanteperdrix wrote: > Jan Kiszka wrote: >> [ And, personally, I don't trust the NVIDIA driver a lot. But that might >> be influenced by the fact that latest versions lock up my notebook >> regularly after resume and that I filed another obvious locking issue of >> the compilable driver stub around mmap_sem without any response from the >> vendor. ] > > Some colleague of mine is using the NVIDIA driver (through the opengl > mapping, not CUDA/VDPAU, whatever) on high-end NVIDIA boards in a non RT > situation. he definitely observed some huge latencies not due to > scheduling issues, when uploading textures to the GPU. We are talking > tens of milliseconds here.
Ugh, tens of milliseconds is heavy, more than I would expect from wbinvd. OTOH, uploading textures may involve mapping the RAM that contains them for the GPU. To exclude that as source, he could try instrumenting CACHE_FLUSH() (in nv-linux.h). Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
