Hi,
On 26/01/2012 01:20, Jason Daly wrote:
On 01/25/2012 04:59 PM, Jason Daly wrote:
Hi, all,
This is a general request to the community for some advice and
expertise. This is a bit lengthy, but if you can spare a few minutes to
look over this and send along your thoughts, we would really
appreciate it.
very interesting and thorough investigation. I can't really add anything
and unfortunately don't have representative hardware to test on. It
would be interesting to see if different bus configs
(motherboards/chipsets) make any difference. I also would not rule out
the NVidia driver doing silly things. I remember once looking at some of
the glue code for the binary blob and seeing TLB flushes that caused a
Xenomai kernel to fail ito timing in interesting ways.
Have you tried OProfile to get some idea of time spent in the driver?
I should also mention that the source code and data sets used in this
work can be made available if anyone would like to try these tests on
their own hardware.
I suggest sending your test apps with your report to NVidia.
rgds
jp
--"J"
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