Re: [ts-7000] RTAI on TS-7250

I have used RTAI on several different
platforms.

I have found you can run very solid
real time interrupts down to approx. 3 msecs.  You can go lower, of
course, but it get's kind of jittery.  The practical limit I've benchmarked
is about 250 microseconds (i.e. at a 250 usec interrupt the real time program
starves linux).  All these were rather sloppy tests, using LXRT rather
than kernel mode.  I have been told that the jitter is more because
of the kernel version -- RTAI in a 2.6 kernel is better.  I have never
really confirmed this myself, and it may just be urban myth.  I also
have heard there are things you can do when compiling the kernel to make
it a little better.  I have never pursued these either.

In comparison, I have never benchmarked
several real time OS's on similar processors -- stuff that cost up to $15K-$20K
a seat -- that worked the same or even worse.  I've used a custom
socket interface, serial, and the embedded web page all in conjunction
with the real time.

 wrote on 07/03/2007 07:34:27
AM:

> Hi all,
> 
> I'm thinking about making some tests with RTAI and TS-7250 to use
this 
> board in even more projects, but I'd like to hear from people who
yet 
> work with this real-time systems how it performs.
> 
> What's the minimum interrupt period, 1ms?
> Do anyone have values about jitter or latency?
> 
> When working with the RT kernel can I use serial, ethernet and usb
> ports or are there some kind of limitations?
> 
> Thanks in advance,
> Marco
> 
> 
> 
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