[Olsr-dev] mac80211 / link-bandwith from userland forcostcalculation / plugin

Henning Rogge (spam-protected)
Mon Sep 13 17:11:35 CEST 2010

Am Montag 13 September 2010, 16:15:35 schrieb Bastian Bittorf:
> > don't forget that all WLAN packets have a prefix which is send with
> the so-called "preamble" (short/long).
> http://wireless.subsignal.org/index.php?title=WLAN-Optimierung
> ofcourse we have to safe airtime wherever possible.
> > a static datarate... but you are right, the amount of measuring
> > packets could depend on the speed of the link. The only problem
> > with this is that we could not use the OLSR TCs/Hellos anymore for
> > measuring the link quality, because they are broadcast packets.
> > That's why I would prefer combining the broadcast lossrate with
> > some unicast probing packets for detecting the link speed.
> make a suggestion wth some sample data.
> but seriously: why use TC/Hellos at all?
Because there are already there, we need them for the routing. So at the 
moment you get multiple measurements of the link per second... for free.

> We already have the link-speed from layer 1/2,
> we just have to do something, that this data is
> up-to-date.
> And: the selected rate (from e.g. minstrel) already
> includes the probability/chance for goodput.
> (we dont have to measure this twice?)
The quality of the measurement of minstrel depends on the amount of unicast 

Henning Rogge

1) You can't win.
2) You can't break even.
3) You can't leave the game.
— The Laws of Thermodynamics, summarized
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