Hi Rob, > On 27 Jul 2019, at 00:18, Rob Jansen <rob.g.jan...@nrl.navy.mil> wrote: > > I am planning on performing an experiment on the Tor network to try to gauge > the accuracy of the advertised bandwidths that relays report in their server > descriptors. Briefly, the experiment involves running a speed test on every > relay for a short time (about 20 seconds). Details follow. > > ... > > Motivation > ---------- > The capacity of Tor relays (maximum available goodput) is an important > metric. Combined with mean goodput, it allows us to compute the bandwidth > utilization of individual relays as well as the entire network in aggregate. > Generally, capacity is used to help balance client load across relays, and > relay utilization rates help Tor make informed decisions about how to > allocate resources and prioritize performance and scalability improvements.
Can you define "goodput"? How is it different to the bandwidth reported by a standard speed test? How is it different to the bandwidth measured by sbws? > ... > > We will conduct the speed tests while minimizing network overhead. We will > use a custom client that builds 2-relay circuits. The first relay will be the > target relay we are speed testing, and the second relay will be a fast exit > relay that we control. We will initiate data streams between a speedtest > client and server running on the same machine as our exit relay. > > The setup will look like: > > speedtest-client <--> tor-client <--> target-relay <--> exit-relay <--> > speedtest-server > > All components will run on the same machine that we control except for the > target-relay, which will rotate as we test different relays in the network. > For each target relay, we plan to run the speedtest for 20 seconds in order > to increase the probability that the 10 second mean goodput will reach the > true capacity. We will measure each relay over a few days to ensure that our > speedtest effects are reported by every relay. Where is your server? How do you expect the location of your server to affect your results? T
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