[tor-relays] Measuring the Accuracy of Tor Relays' Advertised Bandwidths

[grarpamp]

On 8/6/19, Roger Dingledine <arma at torproject.org> wrote:
> On Tue, Aug 06, 2019 at 05:31:39PM -0400, Rob Jansen wrote:
>> Today, I started running the speedtest on all relays in the network.

> There will be another confusing (confounding) factor, which is that the
> ...
> as intended. :) So, call it another thing to keep an eye out for during
> the experiment.

Someone here posted they were testing with sub-minute
durations... tens of seconds. That's unlikely enough to
allow TCP to adjust over everything in the circuit to really
measure "bandwidth". And is instead likely to be measuring
something between "setup latency" and that, with an
uncharacterized ramp in the middle.

You probably want to be scatterplotting a bunch
of different things and durations on metrics.tpo.

And isolating out path nodes and things from
whichever it is you're trying to measure.
Introducing known inputs. Etc.