Dear Sir:
I tested scheduling jitter of Xenomai, Xenomai's jitter is worse than RTAI
on X86, the max jitter is greater than 100us. But, on the ARM
platform(Cortex A8, SBC8100), the max jitter get below 10us. The reason may
be that the workload of ARM platform is lower.
I kown the project of planting RTAI to Cortex A8, it is a open project on
Sourceforge, but the project cannot finished in the short term.
Could you tell me the email of Torsten Koschorrek, I didn't find it on the
RTAI's homepage?
Thanks for your help.
Regards Qin Chenggang
2011/4/2 Jon Elson <[email protected]>
> cnc Qin wrote:
> > HI:
> > We plan port EMC2 to an embedded arm platform, we will open it to
> community, if we can complete successfully. The project is a ambitious plan
> of our lab, we are struggling for it. We wanna know what is need to pay
> attention to, if we contribute our work to EMC2 community?
> > We wanna use Xenomai as the real-time operating system on our ARM
> platform. Like RTLinux, Xenomai based on Linux, too. It is easily portted to
> new hardware platform, but its real-time performance is slightly less than
> RTLinux. We will use some strategies to make up for its shortcoming. We will
> write a new RTAPI for Xenomai, and build a software platform for EMC2 on top
> of our ARM platform, the work may create a new application area of EMC2. We
> are fully confident this work.
> I sent Torsten Koschorrek (the ARM maintainer for RTAI) a Beagle Board
> last year, to help him produce a port for the OMAP3530 CPU chip on that
> board (Cortex A8). Unfortunately, he is still working on it. You might
> contact him, he may have some useful info.
>
> If you want to support software step generation, then real time jitter
> is a major problem, and jitter of more than 50 us could make that
> unworkable. RTAI provides amazing results on modern CPUs such at the
> Intel Atom, usually well under 10 us.
>
> Jon
>
>
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