netdev - Feedback request: iperf 2 asymmetric bounceback outputs

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Message-ID: <CAEBrVk6at+OG7Tw3yU1U95=zSUoGR0m0G6Tx1oj29fK=EbowQQ@mail.gmail.com>
Date: Sat, 11 May 2024 13:52:09 -0700
From: Robert McMahon <rjmcmahon@...cmahon.com>
To: netdev@...r.kernel.org
Subject: Feedback request: iperf 2 asymmetric bounceback outputs

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@...ora:~/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