[Starlink] [Bloat] Of interest: Comcast AQM Paper

[Dave Taht]

On Sun, Aug 1, 2021 at 2:40 PM Dick Roy <dickroy at alum.mit.edu> wrote:
>
> I assume by WiFi what is really meant is devices that have at least one WiFi (layer 1/layer 2) interface. While there are queues in the MAC sublayer, there is really no queue management functionality ... yet ... AFAIK. I know IEEE P802.11bd in conjunction w/ IEEE 1609 is working on implementing a few rudimentary queue mgmt functions.

Thx for the steer to the relevant stds orgs. I dread discovering what
they are up to... However, there is plenty of queue management at the
txop layer.  The structure we put into the linux softmac layer is
described in "ending the anomaly":

The wifi management layer, however, is largely unmanaged, and in some
dense circumstances wifi mgmt frames have been observed to be eating
the most of the airtime available.
>
> That said, seems any AQM in such devices would more than likely be in layer 3 and above.
>
> RR
>
> -----Original Message-----
> From: Starlink [mailto:starlink-bounces at lists.bufferbloat.net] On Behalf Of Livingood, Jason
> Sent: Sunday, August 1, 2021 1:20 PM
> To: Simon Barber
> Cc: starlink at lists.bufferbloat.net; bloat
> Subject: Re: [Starlink] [Bloat] Of interest: Comcast AQM Paper
>
> WiFi is a different challenge as you know. In this case it varies depending on the radio chipset vendor and is on my list of things to work on...
>
> JL
>
> On 7/31/21, 13:50, "Simon Barber" <simon at superduper.net> wrote:
>
>     Awesome to hear that you are turning this on both upstream and downstream. Do you know if the wifi stacks in your home routers also have AQM?
>
>     Simon
>
>
>     > On Jul 30, 2021, at 10:28 PM, Livingood, Jason via Bloat <bloat at lists.bufferbloat.net> wrote:
>     >
>     > FYI that I will be presenting a lightning talk at the IRTF MAPRG meeting today at 17:30 ET (https://urldefense.com/v3/__https://datatracker.ietf.org/meeting/111/materials/agenda-111-maprg__;!!CQl3mcHX2A!XLFMYPw-gnJgHzz_1nF-N7dNeIeT4QD-5wQny8vdAfYE6bzHtVQD3-lqiQI9YwAncrZUew$ ). The talk links to a just-published paper at https://urldefense.com/v3/__https://arxiv.org/abs/2107.13968__;!!CQl3mcHX2A!XLFMYPw-gnJgHzz_1nF-N7dNeIeT4QD-5wQny8vdAfYE6bzHtVQD3-lqiQI9YwCePfNyng$  (click PDF link in upper right of page) that will likely be of interest to these two lists.
>     >
>     > High-level: turning on AQM in the cable modem (upstream queue) took working latency from around 250 ms to between 15-30 ms, which is actually kind of cool. ;-) AQM is turned on in all of our CMTSes (downstream queue) and in DOCSIS 3.1 modems (upstream queue).
>     >
>     > Have a nice weekend,
>     > Jason
>     >
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>
>
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--
Fixing Starlink's Latencies: https://www.youtube.com/watch?v=c9gLo6Xrwgw

Dave Täht CEO, TekLibre, LLC