[Battlemesh] tests for downloads ? and tests follow-ups

[Juliusz Chroboczek]

Interesting.  Thanks to all of you for compiling this data.

Axel, could we have a histogram of the distribution of protocol packet
sizes?

A few comments, after staring at it for just a few minutes:

(1) I'm impressed by the good results of BMX6.  Axel, is there
a detailed description of the protocol?

(2) No loops in Babel and BMX6, as expected.  Some loops in BATMAN,
which I don't understand.  Moderate number of loops in OLSR, as
expected.  No data for BATMAN-adv.

(3) The issue with Babel having high protocol overhead in marginal
networks is still present, as expected.  This is due to Babel sending
a bunch of explicit requests whenever it loses a route (Section 3.8.2.1
of RFC 6126); I'm considering a fix that would consist in rate-limiting
the requests, but I need to get the details right.

(4) Surprisingly low protocol overhead for OLSR.  Counter-intuitively
enough, OLSR's strategy which consist in having no adaptative intervals
at all appears to pay off in this particular case.

(5) Although Babel was being run with a higher hello interval, its
performance in the mobility scenarios was as good or better than that of
the other protocols.

--Juliusz