Doing an MPEG TS monitor program...Using QNX 4.25 and TCP 5.0
Hitting the limits of TCP, me thinks,  box has to process a  2 multicast 
streams of  1340 byte UDP/RTP  every .2 ms for each channel.
Can process up to about 12000 messages / second just fine (4 multicast 
sockets/2 channels). After that, messages start getting dropped.

Even reducing to 1 streams still results in issue (sending 20 packets 
every 3 ms) results in problem.

It does appear that Tcpip has some finite limit of packets it will queue 
onto socket for processing...

Any insight on what Tcpip does ?