I get such report from 'iperf -c X.X.X.X -u -b 900m' on FreeBSD-9.0:
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Client connecting to X.X.X.X, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
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[ 3] local X.X.X.X port 14759 connected with X.X.X.X port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 143130668490615 bits 1307348947953615072292327409132s/sec
[ 3] Sent 634267 datagrams
[ 3] Server Report:
[ 3] 0.0-10.0 sec 842 MBytes 706 Mbits/sec 0.090 ms 33818/634266 (5.3%)
[ 3] 0.0-10.0 sec 1 datagrams received out-of-order