DeltaQ (ΔQ) measurement tool

[coot]

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Specification of ΔQ measurement tool:

1. single protocol build on top of typed-protocol described bellow
2. the protocol should allow to send arbitrary large requests (drawn from some distribution) messages, which allows to measure ΔQ. This part should be similar to the ping-pong protocol but allows to carry data along pings and pongs, together with timestamp information.
3. it should also allow to exchange ΔQ information between both sides.
4. validate the received ΔQ

The client would collect time stamps when a request was send, when received together with the request size, then plot flight time as a function of its size. The client, using linear regression, can find out how long it takes to send request with 0 size. This is the g component of ΔQ which can be exchanged in point 3. above.

Since it's a single typed-protocol it will not require to use network-mux library, and this is an important requirement. We want it to run on a bear bearer (typed-protocols require that the bearer delivers messages in order, for now we keep this as an assumption).

Future development might include:

• making ΔQ measurement persistent across sessions
• plotting time to completion as a function of size for each session; it is useful to compare ΔQ between different sessions.
• @karknu made a request that this tool could analyse pcap files to get ΔQ information.