[Babel-users] Heads up: babeld to remove diversity routing

[Benjamin Henrion]

Le mer. 4 mai 2022 à 19:08, Dave Taht <dave.taht at gmail.com> a écrit :

> The channel model used by babel got clobbered by the increases in
> channel width, and the underlying behavior of subsequent wifi
> standards,
> where stuff used a base channel and was supposed to sense the usage of
> the other channels (but rarely did it right).
>

There is missing support for newer wifi standards, which have much more
spectrum, and use multiple channels at the same time. The way multiple
channels are used are hidden in the proprietary firmwares of those radios.

Nevertheless, the feature is still very useful for radios up to 802.11g.
802.11n and ac and successors use multiple MIMOs, which might improve the
situation for mesh networks, or not.

I would keep it, and add support for those 'new' 802.11 standards, as that
was proposed in the past.

And of course make some tests on a real setup.

Best,


> I don't know how to do it right. I find it mind boggling that most
> devices are shipping today with 160Mhz channels when the real problem
> was bandwidth at range, and users choosing smaller channel widths
> would get them that more power and range, and co-ordinating on which
> channels to use. One AP per room seems to be the trend. In the last
> modern wifi-infested apartment building I was in the household AP had
> an effective range of 8 feet and one wall, and 23 devices within range
> all on the same base channel.
>
> WiFi 7 is even weirder, with things like DU (and adhoc mode remains
> really hard to get. I keep hoping something else will appear that can
> scale). 6ghz will not remain a clean zone for very long if trends like
> this continue.
>
> I agree with ripping the concept out of babel. It seemed like such a
> good idea at the time....
>
> On Wed, May 4, 2022 at 9:28 AM Gio <gio at diveni.re> wrote:
> >
> > On Wednesday 4 May 2022 15:04:34 CEST Juliusz Chroboczek wrote:
> > > After 1.12 is out, I plan to remove the diversity routing code, which
> has
> > > not been shown to be useful in practice.  If you find diversity routing
> > > useful in your setup, please speak up.
> >
> > If I remember well this is the feature to take in account if multiple
> > interfaces in a router are interfering or not, as of today librerouter
> have
> > multiple radios but we never got to the point to generate babel
> configuration
> > that inform the routing daemon about the interfaces being interfering or
> not,
> > it should be not that hard (just check WiFi channels used by the
> interfaces
> > are far enough) but we never got there, probably because we never
> identified
> > that as a bottleneck in our community networks.
> >
> >
> >
> > _______________________________________________
> > Babel-users mailing list
> > Babel-users at alioth-lists.debian.net
> > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/babel-users
>
>
>
> --
> FQ World Domination pending:
> https://blog.cerowrt.org/post/state_of_fq_codel/
> Dave Täht CEO, TekLibre, LLC
>
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