Philippe Gerum wrote:
> On Thu, 2007-05-03 at 17:07 +0200, Gilles Chanteperdrix wrote:
>
> That was not my point. My point was: don't stuff huge semi-random values
> into /proc/xenomai/latency to work around terrible jittery especially
> when porting Xenomai over new platforms, because this is _likely_ the
> sign of something going wrong elsewhere.
>
> E.g. An oldish 90Mhz classic pentium exhibits ~25 us core latency
> figures with Xenomai; some ARM hw may require more because of
> unfortunate memory sub-systems, but in any case, you have to
> _understand_ (e.g. using the tracer) why it is so, first.
I agree. I still have to see for myself why these damned ARMs have such
high latencies.
>>We should add a page on the wiki about the latency calibration.
>>
>
>
> We should also provide an external tool for determining the most
> appropriate latency for a given workload / configuration.
The latency tool already does a great deal of this job.
--
Gilles Chanteperdrix
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