After a couple days of digging on the problem, I've found out (through my own watered down implementation of a iperf-like tool) that the sendto method is blocking at higher rates (indicating the buffer is full). I verified this by chaning my implementation to be non blocking on that socket file descriptor. I haven't dove into the iperf code yet (and don't know that I will), but I am guessing that this is also the case as the maximum send rates are about the same for iperf and the tool I have. Now that I know what is going on I think I can deal with it. Thanks for all your help.
Randy
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