netperf - UDP_STREAM close to 100% packet drops

[Mahesh Acharya]

Hi ,
I am using netperf 2.4.4 on 2 linux boxes.
TCP_STREAM tests shows a throughput of 93Mb/sec.
Problem is with the UDP_STREAM, where the packet drop rate is close to 100% as shown below

netperf -t UDP_STREAM -H -l 20 -- -s 128K -S 128K -m 32K -M 32K

UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 16.138.181.45 (16.138.181.45) port 0 AF_INET : histogram : interval : demo
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec

262142 32768 20.00 72914 0 955.61
262142 20.00 3 0.04

Any clues for why this behavior?
Thank you
Mahesh

[rick jones]

Over in the origial, misplaced, post in the hpux forum I speculate that this is an issue with speed-mismatch between the sender at 1G and (something between the sender and) the reciever at 100BT.