[Rpm] lightweight active sensing of bandwidth and buffering

[rjmcmahon]

Bufferbloat shifts the minimum of the latency or OWD CDF. A suggestion 
is to disable x-axis auto-scaling and start from zero.

Bob
> For about 2 years now the cake w-adaptive bandwidth project has been
> exploring techniques to lightweightedly sense  bandwidth and buffering
> problems. One of my favorites was their discovery that ICMP type 13
> got them working OWD from millions of ipv4 devices!
> 
> They've also explored leveraging ntp and multiple other methods, and
> have scripts available that do a good job of compensating for 5g and
> starlink's misbehaviors.
> 
> They've also pioneered a whole bunch of new graphing techniques, which
> I do wish were used more than single number summaries especially in
> analyzing the behaviors of new metrics like rpm, samknows, ookla, and
> RFC9097 - to see what is being missed.
> 
> There are thousands of posts about this research topic, a new post on
> OWD just went by here.
> 
> https://forum.openwrt.org/t/cake-w-adaptive-bandwidth/135379/793
> 
> and of course, I love flent's enormous graphing toolset for simulating
> and analyzing complex network behaviors.