Re: [Starlink] FQ_Codel

[Dave Taht <dave.taht@gmail.com>]

On Wed, Jun 8, 2022 at 5:21 PM David Lang <david@lang.hm> wrote:
>
> multiple access points, good. Mesh can make the problem worse.
>
> The combination of hidden transmitters (station in the middle can hear stations
> on both ends, but they can't hear each other and so step on each other) and just
> more airtime needed ro relay the messages as there are more hops can make the
> congestion worse (however, it is possible that higher data rates could make the
> transmissions shorter, but since the inter-aggregate gaps and per-aggregate
> headers are fixed at a low data rate, I doubt that it works that way in
> practice)
>
> but get a few additional APs hooked together via wires, and you have a clear win
> that scales very well. It's what we do at the Scale conf with 100+ APs to
> support 3k+ geeks.

Is there a physical scale conference this year? (It's in LA and a lot
of space/film folk go there)

For those that don't know, david lang has been putting together the
fq_codeled APs there for what? 8 years now? Conference feedback on the
wifi has generally been uniformly positive.

What APs do you use now?

> David Lang
>
> On Wed, 8 Jun 2022, Stuart Cheshire wrote:
>
> > On 8 Jun 2022, at 12:12, warren ponder <wponder11@gmail.com> wrote:
> >
> >> So this is really helpful. Is it fair to say then that end users with SQM and fq_codel on a Starlink connection should essentially not turn on SQM.and.just leave it off?
> >
> > My advice is that people should have SQM (e.g., fq_codel) enabled anywhere it is available. For devices that aren’t the bottleneck hop on a path it won’t make any difference, but it won’t hurt. And if the network topology is such that it does become the bottleneck hop, even briefly, SQM will avoid having a big queue build up there.
> >
> > One example is Wi-Fi. If you have 50Mb/s Internet service and 802.11ac Wi-Fi in the house, your Wi-Fi is unlikely to be the bottleneck. But if you walk out to the garden and the Wi-Fi rate drops to 40Mb/s, then suddenly bufferbloat in the AP can bite you, leading to bi-modal network usability, that abruptly falls off a cliff the moment your Wi-Fi rate drops below your Internet service rate. I think this is a large part of the reason behind the enthusiasm these days for “mesh” Wi-Fi systems -- you need to blanket your home with sufficient density of Wi-Fi access points to ensure that they never become the bottleneck hop and expose their incompetent queue management. If you get 11Mb/s in the garden that should be plenty to stream music, but throw in some egregious bufferbloat and a perfectly good 11Mb/s rate becomes unusably bad. Ironically, if you pay more for faster Internet service then the problem gets worse, not better, because the effective usable range of your bufferbloate
>  d Wi-Fi access points shrinks as the rate coming into the house goes up.
> >
> > Stuart Cheshire
> >
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-- 
FQ World Domination pending: https://blog.cerowrt.org/post/state_of_fq_codel/
Dave Täht CEO, TekLibre, LLC