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

Fri May 12 16:39:53 EDT 2023

I use virtual machines from linode (which was bought by Akamai)

You may want to use --permit-key (or -t on the server side) to protect 
against unauthorized use.

--permit-key [=<value>]
Set a key value that must match for the server to accept traffic on a 
connection. If the option is given without a value on the server a key 
value will be autogenerated and displayed in its initial settings 
report. The lifetime of the key is set using --permit-key-timeout and 
defaults to twenty seconds. The value is required on clients. The value 
will also be used as part of the transfer id in reports. The option set 
on the client but not the server will also cause the server to reject 
the client's traffic. TCP only, no UDP support.

--permit-key-timeout <value>
Set the lifetime of the permit key in seconds. Defaults to 20 seconds if 
not set. A value of zero will disable the timer.

-t, --time n
time in seconds to listen for new traffic connections, receive traffic 
or send traffic

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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