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

Fri May 12 11:53:07 EDT 2023

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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