[Rpm] iperf 2 bounceback - independent request/reply sizes

[rjmcmahon]

Glad to hear that. Hopefully, it's useful!! Disclaimer: Very limited 
testing.

Bob
> Hi Bob,
> 
> 
> funny, that is a feature we wanted recently for cake-autorate (not for
> the controller but for hypothesis testing of what funny things might
> happen over LTE). Our "poor man's" version was ICMP echo requests
> against 8.8.8.8 as google accepts large echo requests, but only sends
> "truncated" replys....
> 
> Have a real tool like iperf2 allow to request the size per direction
> directly is much better (well, it leaves the challenge of getting
> one's own iperf2 server up somewhee accessible on the internet).
> 
> Regards
> 	Sebastian
> 
> 
>> On May 12, 2023, at 17:46, rjmcmahon via Rpm 
>> <rpm at lists.bufferbloat.net> wrote:
>> 
>> Hi All,
>> 
>> I received a recent diff for iperf 2 to support independent request 
>> and reply sizes for the bounceback test. It's nice to get diffs that 
>> can be patched in!
>> 
>> [root at ctrl1fc35 ~]# iperf -c 192.168.1.231 --bounceback 
>> --bounceback-reply 512K
>> ------------------------------------------------------------
>> Client connecting to 192.168.1.231, TCP port 5001 with pid 305401 (1 
>> flows)
>> Bounceback test (req/reply size = 100 Byte/ 512 KByte) (server hold 
>> req=0 usecs & tcp_quickack)
>> Bursting request 10 times every 1.00 second(s)
>> TCP congestion control using reno
>> TOS set to 0x0 and nodelay (Nagle off)
>> TCP window size: 85.0 KByte (default)
>> ------------------------------------------------------------
>> [  1] local 192.168.1.15%enp2s0 port 42800 connected with 
>> 192.168.1.231 port 5001 (bb w/quickack len/hold=100/0) (sock=3) 
>> (icwnd/mss/irtt=14/1448/3302) (ct=3.36 ms) on 2023-05-12 08:36:57.163 
>> (PDT)
>> [ ID] Interval        Transfer    Bandwidth         BB 
>> cnt=avg/min/max/stdev         Rtry  Cwnd/RTT    RPS(avg)
>> [  1] 0.00-1.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=10.924/7.497/27.463/5.971 ms    0   14K/3992 us    92 rps
>> [  1] 1.00-2.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=10.068/7.274/21.120/3.963 ms    0   14K/4307 us    99 rps
>> [  1] 2.00-3.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=9.674/8.148/17.413/2.798 ms    0   14K/4243 us    103 rps
>> [  1] 3.00-4.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=9.858/7.587/20.889/3.961 ms    0   14K/4474 us    101 rps
>> [  1] 4.00-5.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=9.872/7.558/17.720/2.842 ms    0   14K/4692 us    101 rps
>> [  1] 5.00-6.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=9.649/6.844/18.537/3.205 ms    0   14K/4301 us    104 rps
>> [  1] 6.00-7.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=9.502/7.083/19.839/3.697 ms    0   14K/4153 us    105 rps
>> [  1] 7.00-8.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=9.965/7.747/22.194/4.350 ms    0   14K/4357 us    100 rps
>> [  1] 8.00-9.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=10.072/7.936/20.307/3.730 ms    0   14K/4442 us    99 rps
>> [  1] 9.00-10.00 sec  5.00 MBytes  42.0 Mbits/sec    
>> 10=10.031/8.109/19.907/3.551 ms    0   14K/4086 us    100 rps
>> [  1] 0.00-10.02 sec  50.0 MBytes  41.9 Mbits/sec    
>> 100=9.962/6.844/27.463/3.740 ms    0   14K/4152 us    100 rps
>> [  1] 0.00-10.02 sec  BB8(f)-PDF: 
>> bin(w=100us):cnt(100)=69:1,71:1,73:1,75:1,76:3,77:1,78:2,79:3,80:3,81:1,82:6,83:7,84:1,85:3,86:4,87:4,88:4,89:5,90:7,91:3,92:4,93:2,95:8,96:3,97:1,98:1,99:1,101:3,102:1,103:1,104:1,106:2,123:1,175:1,178:1,186:1,199:1,200:1,204:1,209:1,212:1,222:1,275:1 
>> (5.00/95.00/99.7%=76/204/275,Outliers=1,obl/obu=0/0)
>> 
>> Bob
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