[Rpm] iperf 2 responsiveness test in 2.1.8-rc, --bounceback option

[Bob McMahon <bob.mcmahon@broadcom.com>]

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Hi All,

I've added a low impact, low duty cycle responsiveness test to iperf 2.  Man
page is here. <https://iperf2.sourceforge.io/iperf-manpage.html>

[rjmcmahon@bobcat iperf2-code]$ iperf -v
iperf version 2.1.8-rc (6 August 2022) pthreads

[rjmcmahon@bobcat iperf2-code]$ iperf -s --permit-key=mytest  -P 1
--hide-ips
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size:  128 KByte (default)
Permit key is 'mytest' (timeout in 20.0 seconds)
------------------------------------------------------------

[rjmcmahon@ryzen3950 iperf2-code]$ iperf -c hostname -i 1 --bounceback
--permit-key=mytest --hide-ips
------------------------------------------------------------
Client connecting to (**hidden**), TCP port 5001
Bursting:  100 Byte writes 10 times every 1.00 second(s)
Bounce-back test (size= 100 Byte) (server hold req=0 usecs)
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[mytest(1)] local *.*.*.96 port 38048 connected with *.*.*.123 port 5001
(bb len/hold=100/0) (icwnd/mss/irtt=14/1448/15038)
[ ID] Interval        Transfer    Bandwidth         BB
cnt=avg/min/max/stdev         Rtry  Cwnd/RTT    RPS
[mytest(1)] 0.00-1.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.333/9.247/15.596/2.493 ms    0   14K/11667 us    88 rps
[mytest(1)] 1.00-2.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=10.164/9.340/13.791/1.417 ms    0   14K/10374 us    98 rps
[mytest(1)] 2.00-3.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.301/9.321/14.310/2.010 ms    0   14K/10796 us    88 rps
[mytest(1)] 3.00-4.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.242/9.432/14.401/2.128 ms    0   14K/10720 us    88 rps
[mytest(1)] 4.00-5.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.576/9.558/14.442/2.196 ms    0   14K/10821 us    86 rps
[mytest(1)] 5.00-6.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.310/9.514/14.615/2.151 ms    0   14K/10806 us    88 rps
[mytest(1)] 6.00-7.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=10.944/9.310/14.490/2.233 ms    0   14K/10548 us    91 rps
[mytest(1)] 7.00-8.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.584/9.468/19.286/3.254 ms    0   14K/10794 us    86 rps
[mytest(1)] 8.00-9.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=10.987/9.378/14.322/2.139 ms    0   14K/10533 us    90 rps
[mytest(1)] 9.00-10.00 sec  1.95 KBytes  16.0 Kbits/sec
 10=11.449/9.930/14.722/2.151 ms    0   14K/10832 us    87 rps
[mytest(1)] 0.00-10.03 sec  19.5 KBytes  15.9 Kbits/sec
 100=11.189/9.247/19.286/2.190 ms    0   14K/11083 us    89 rps
[  1] 0.00-10.03 sec BB8(f)-PDF:
bin(w=100us):cnt(100)=93:1,94:9,95:5,96:11,97:9,98:2,99:5,100:6,101:9,102:3,103:3,104:1,105:1,106:2,107:1,115:1,129:1,130:1,132:1,137:1,138:2,139:3,141:4,142:2,143:4,144:3,145:4,147:2,148:1,156:1,193:1
(5.00/95.00/99.7%=94/147/193,Outliers=0,obl/obu=0/0)

Bob

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