[tsvwg] Re: [iccrg] iperf2 Android update: Bounceback fixes and IPv6 support

[[e-mail]]

Thanks for the feedback Sebastian. It helps much.

I'm adding some volatilty lines. The RSP moving average and smoothing is 
hiding that when it occurs.

Also, looking into a stat like earth movers distance against a gausian. 
Or maybe against an golden run.

https://en.wikipedia.org/wiki/Earth_mover%27s_distance

We'll be recruting internal testers for Google Play soon.

Bob
> Hi Bob,
> 
> this is getting better and better, CDF and PDF of the RPS data and 
> throughput traces of potential working loads are really helping 
> understanding what is going on!
> 
> Regards
> 	Sebastian
> 
>> On Jul 24, 2026, at 08:38, 
>> bob.mcmahon=[e-mail] wrote:
>> 
>> Hi All,
>> 
>> I've updated the iperf 2 android bounceback test to display the 
>> histogram with a CDF overlay. UDP L4S bounce back is still beind coded 
>> up and tested.
>> 
>> 
>> 
>> On 2026-07-22 11:57, [e-mail] wrote:
>>> Hi all,
>>> An updated iperf2 Android build is available with two Bounceback 
>>> fixes.
>>> First, a bug that caused responsiveness and RPS tests under working 
>>> load to fail after a few seconds has been fixed. The update has been 
>>> verified with a 50-second Bounceback run under load.
>>> Second, the selected congestion-control algorithm now applies at both 
>>> ends of the Bounceback connection. Anyone comparing 
>>> congestion-control algorithms should repeat those tests with this 
>>> build.
>>> The public responde.* servers support Reno, Cubic, and BBR, with 
>>> Cubic as the default. They do not currently support Prague. Prague 
>>> testing requires both a server and a device with Prague available.
>>> The public servers have already been updated. If you use your own 
>>> iperf2 server, please update it from the 2-2-2 branch.
>>> The public servers limit tests to 60 seconds, so please select a 
>>> shorter duration.
>>> Android client presentation:
>>> https://www.umbernetworks.com/IPPM_iperf2_Android_Pres.html
>>> Install the updated APK
>>> Download this exact file from the SourceForge file listing:
>>> iperf2.2.2_21.bb_cca_fix.July2026_android.apk
>>> https://sourceforge.net/projects/iperf2/files/
>>> Please select the filename directly rather than using the green 
>>> Download button, which may retrieve a different file. The APK can be 
>>> installed over an existing version.
>>> Features worth testing
>>> Bounceback now displays the minimum RTT reported by the kernel's TCP 
>>> statistics, together with a theoretical RPS ceiling:
>>> Theoretical RPS ceiling = 1,000 ms / minimum TCP RTT
>>> For example, a minimum TCP RTT of 20 ms gives a theoretical ceiling 
>>> of 50 request-and-reply cycles per second.
>>> Minimum RTT is a TCP statistic, while observed RPS is measured from 
>>> the application-level Bounceback exchanges. Because each request 
>>> waits for its reply before the next request is sent, actual RPS will 
>>> normally be lower because of application processing, scheduling, 
>>> working load, and other path effects.
>>> The public responde.* servers in Fremont, Vienna, and Newark also 
>>> support IPv6. The app can select IPv6 normally through the Host 
>>> field, or you can enable Force IPv6 (-V) to test the IPv6 path 
>>> explicitly. Your local network must also support IPv6.
>>> Thanks again to everyone testing the app and providing feedback. It 
>>> is very helpful.
>>> Bob
>> 
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