Some testing for very high speed interfaces can overrun the hardcoded listen backlog in the code.
It would be ideal if there was a command line argument (-q n, --backlog n) to change the default from 5 to some other value.
Attached is a potential patch for 2.0.2 that does this.
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It looks like the patch was corrupted. Try this one.
File Added: iperf.txt
potential patch for the enhancement for 2.0.2