On Fri, 2007-08-31 at 17:17 +0200, Robert Schwebel wrote: > Hi, > > We are currently porting a userspace realtime network stack (Ethernet > Powerlink -> EPL) to RT-Preempt, in order to play with the system and > find out what is possible today with a standard linux-rt and userspace > socket based stacks. > > We currently see a strange latency effect. The scenario is like this: > > +--------+ +-----------+ +-----------+ > | PC EPL | | Second PC | | EPL Clamp | > +--------+ +-----------+ +-----------+ > | | | > \ +----------+ / > \----| Hub |------/ > +----------+ > Can you eliminate the hub as a variable? I have seen very similar experiments with multicast packets where the hub delivered packets out of order, or in a delayed fashion on one port, but not on the other. Sven - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
