Feedback request: iperf 2 asymmetric bounceback outputs
From: Robert McMahon <hidden>
Date: 2024-05-11 21:01:56
Hi All, One feature of iperf 2's bouncecback is the asymmetric write size between the request and reply. I'm considering the output as shown below. The transfer values include both directions. The per direction is bytes only. Comments are welcome. rjmcmahon@fedora:~/Code/bb/iperf2-code$ src/iperf -c 127.0.0.1 -e -i 1 -t 3 --bounceback=1 --bounceback-period 0 --bounceback-request 1000 --bounceback-reply 500 ------------------------------------------------------------ Client connecting to 127.0.0.1, TCP port 5001 with pid 63480 (1/0 flows/load) Bounceback test (req/reply size =1000 Byte/ 500 Byte) (server hold req=0 usecs & tcp_quickack) TCP congestion control using cubic TOS defaults to 0x0 (dscp=0,ecn=0) and nodelay (Nagle off) TCP window size: 2.50 MByte (default) ------------------------------------------------------------ [ 1] local 127.0.0.1%lo port 47210 connected with 127.0.0.1 port 5001 (bb w/quickack req/reply/hold=1000/500/0) (icwnd/mss/irtt=162/16640/32) (ct=0.08 ms) on 2024-05-11 13:27:11.441673 (PDT) [ ID] Interval Transfer Bandwidth BB cnt=avg/min/max/stdev Rtry Cwnd(pkts)/RTT(var) Tx/Rx bytes RPS(avg) [ 1] 0.00-1.00 sec 63.2 MBytes 530 Mbits/sec 44171=0.022/0.016/0.389/0.003 ms 0 639K/(10)/13(0) us Tx=42.1 MByte Rx=21.1 MByte RPS=46006 [ 1] 1.00-2.00 sec 45.3 MBytes 380 Mbits/sec 31671=0.030/0.022/0.086/0.007 ms 0 639K/(10)/19(0) us Tx=30.2 MByte Rx=15.1 MByte RPS=32967 [ 1] 2.00-3.00 sec 38.0 MBytes 319 Mbits/sec 26581=0.036/0.031/0.077/0.003 ms 0 639K/(10)/19(1) us Tx=25.3 MByte Rx=12.7 MByte RPS=27715 [ 1] 0.00-3.01 sec 147 MBytes 408 Mbits/sec 102424=0.028/0.016/0.389/0.008 ms 0 -(-)/-(-) Tx=97.7 MByte Rx=48.8 MByte RPS=35565 [ 1] 0.00-3.01 sec BB8(f)-PDF: bin(w=100us):cnt(102424)=1:102421,2:1,4:2 (5.00/95.00/99.7%=1/1/1,Outliers=0,obl/obu=0/0) Thanks in advance for any comments, Bob