kiszka at rts.uni-hannover.de
Mon Nov 18 11:27:11 CET 2002
Alexander Eisenhuth schrieb:
> Jan Kiszka wrote:
>> Alexander Eisenhuth schrieb:
>> > ...
>>> I've read in the archive about RTNet. It sound exactly what I need,
>>> but unfortunatly the chipset I'm using is not supported.
>>> * Can anyone say something about the dependencies to the chipset ? At
>>> a first look there seems to be no abstract approach to "soften" the
>>> support of new Cards.
>> If you only want soft real-time networking with a RTAI kernel API, you
>> could use the RTnet-wrapper for net_rpc. It comes with current RTAI
> What priorities are raised in that case ? Can you loose a few words on
> net_rpc ?
I would say (without knowing everything in details) that no priorities
are raised. All incoming and outgoing udp data is treated as any other
linux tcp/udp/ip packets. That means everything happening in the
RT-domain has higher priority than your udp packets - even if the
rt-priority of that tasks are lower than you sender or receiver. And in
linux, there is no change of priorities at all.
About net_rpc: we haven't tried it for months here at the RTS (at the
moment we do need it). If it already works with RTnet, you get a remote
procedure call mechanism for most RTAI functions over ethernet. Maybe
Paolo has already made some experiments with current RTnet and net_rpc...
Dipl.-Ing. Jan Kiszka
Institute for Systems Engineering, Department of Real-Time Systems (RTS)
Appelstraße 9A, D-30167 Hannover
phone +49 511 762-3974 / fax +49 511 762-4012
More information about the Rtai