Yes,

in some words:

RTAI is much faster, but relies on the kernel you have, so it is much 
more complicated to be included in software parts.
It is mostly needed only for very high speed applications

PREEMPT-RT is a a little bit slower than RTAI, but can be implemented in 
software much easier, just imagine it is a modul.

That is very simple explained, there are more differences. For a normal 
CNC opperation both should work fine. But if you use i.e. software 
stepgenerator over a LPT, than take the RTAI.

Norbert

Am 03.01.2016 um 19:06 schrieb Karlsson & Wang:
> Do anybode know the difference between RTAI and PREEMPT-rt?
>
> Regards Nicklas Karlsson
>
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