Jan Kiszka wrote:
> 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).
No, it really looks like a bug in the blob. Of course the 40ms is a spot
from time to time, usually, the upload is really fast.
--
Gilles.
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