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

Dick Roy dickroy at alum.mit.edu
Sun Aug 1 17:39:55 EDT 2021

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.  

That said, seems any AQM in such devices would more than likely be in layer 3 and above.  


-----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...


´╗┐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?


    > 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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