Re: [Xenomai] Altera Cyclone V

[Charles Steinkuehler <charles@steinkuehler.net>]

On 1/7/2014 4:47 PM, Gilles Chanteperdrix wrote:
> On 01/07/2014 11:19 PM, Charles Steinkuehler wrote:
>> The single-core A8 on the
>> BeagleBone is good for about 25 uS typical and 80 uS or so worst case
>> latency.
> 
> That is really high. On a 720MHz OMAP3, with the latency test running
> with a 100us period, I typically get latencies close to 40us (under
> dohell load). Granted I do not run many functionalities of the SOC
> (typically, not the graphic processor), but I would not expect latencies
> to get so high. Is there any chance you could trigger a trace with the
> I-pipe tracer?

I can try...give me a while to sort through the I-pipe:Tracer wiki page
(or are there better instructions?).

This may also have improved somewhat...my numbers are from a year or so
ago when everything first started working.  I haven't been regression
testing the latest kernels.  <blush>  I know there have been significant
improvements on both the Xenomai side and with the BeagleBone kernel
patches/drivers.

-- 
Charles Steinkuehler
charles@steinkuehler.net

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