[Babel-users] RTT-aware branch of Babel

[Henning Rogge]

On Fri, Jun 21, 2013 at 7:25 PM, Dave Taht <dave.taht at gmail.com> wrote:
> On Fri, Jun 21, 2013 at 10:04 AM, Henning Rogge <hrogge at googlemail.com> wrote:
> At the lowest timescale possible on a given link you are
> either at capacity 1 or 0.

Same problem for packetloss based metrics in mesh networks. They are
awful to measure unless a link has lots of traffic (or you generate
lots of probing traffic).

> I need to get around to monitoring packet drops better via mrtg in
> particular and add some more instrumentation to the kernel as to when
> and why they happen...

The mac80211 driver gives you at least some statistics on how much
traffic dropped (and on some wifi drivers how many retransmissions
happened).

> And I keep wondering about what traffic on wifi "really" looks like in
> relation to this wonderful, old, paper, that has embedded itself in
> many a conciousness...

I would say it looks very chaotic.

Its the bane of every routing metric in a mesh... how to get the
metric both stable enough to be useful and fast enough to be useful.

Henning Rogge

--
We began as wanderers, and we are wanderers still. We have lingered
long enough on the shores of the cosmic ocean. We are ready at last to
set sail for the stars - Carl Sagan