Re: [homenet] ISIS wifi testing

Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> Thu, 29 October 2015 13:44 UTC

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Date: Thu, 29 Oct 2015 14:44:35 +0100
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From: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
To: Gabriel Kerneis <kerneis@google.com>
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References: <alpine.DEB.2.02.1510161434010.16053@uplift.swm.pp.se> <27777.1445024142@sandelman.ca> <alpine.DEB.2.02.1510231149150.16053@uplift.swm.pp.se> <CAL0WyWxhA9nE1KTYWRFnSQu+ix5dq99DxAtamaPVa9keKJhSiA@mail.gmail.com>
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Cc: HOMENET <homenet@ietf.org>, Mikael Abrahamsson <swmike@swm.pp.se>
Subject: Re: [homenet] ISIS wifi testing
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> Are all your AP on the same frequency? Did you enable diversity-sensitive
> routing for babel? If not, you should add in /etc/config/babeld:
> 
> config general
> option diversity true

I disagree, Gabriel -- since IS-IS doesn't do diversity routing, the
comparison is more interesting if babeld doesn't either.  I'd much rather
have two comparisons:

  - IS-IS compared to non-diversity Babel;
  - diversity Babel compared to non-diversity Babel.

We did some work on that with Gabriel a few years ago, and we found out
that the results are somewhat paradoxical: diversity Babel appears to beat
plain Babel in uncongested networks, but yields similar results in
congested ones.  My interpretation is that in a congested network packet
loss is a good indicator of interference, and therefore plain Babel
converges to a non-interfering set of routes without explicit interference
measurements.

The tests need repeating in a more formal setting, but they are extremely
time consuming, and more urgent stuff came up.

-- Juliusz