Thanks Michael for all these tips. I have tried several suggestions as you proposed here. I couldn't see performance any better. The TCP_RR is dropped to 472 trans/s from about 18,000 trans/s , and TCP_STREAM BW is dropped to 1/3 as before ( ehca + scaling code) with same TCP configuration, send queue size=recve queue size = 1K.
Thanks
Shirley Ma
IBM Linux Technology Center
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