[Starlink] Network quality for rocket scientists

[Sebastian Moeller]

Hi Dave,


> On Feb 14, 2022, at 16:30, Dave Taht <dave.taht at gmail.com> wrote:
> 
> It is wonderful to see another take on this subject from another perspective!


"See the problem? Buffers produce jitter!"


I would rephrase that as "over-sized and under-managed" buffers increase jitter unduly. Interestingly, bound jitter can be converted into static latency by using, wait for it, (delay) buffers and a scheduler.



> 
> Only nit is at the conclusion... the benefits of applying fair queuing
> to level out apparent jitter is well demonstrated at this point, for
> most kinds of traffic. Wish you'd mentioned it.

	I rather wish low latency DOCSIS (LLD) aka L4S's primary driver/use-case would not have been mentioned before it has been properly tested and confirmed delivering on its promises. Because most of what L4S offers/mandates for jitter reduction is "hopes and prayers", aka end-points are supposed to behave well... in fairness LLD at least has a poor man's FQ on board in the guise of "queue protection" (with by default like 32 "buckets")... some of the cost of FQ with only few of its benefits...

Regards
	Sebastian



> 
> 
> On Mon, Feb 14, 2022 at 7:07 AM Bjørn Ivar Teigen <bjorn at domos.no> wrote:
>> 
>> Hi everyone,
>> 
>> I was inspired by the latest Starship presentation to write a piece on network quality in the language of rocket science. The blog can be found here: https://www.domos.no/news-updates/network-quality-for-rocket-scientists
>> 
>> Cheers,
>> Bjørn Ivar Teigen
>> 
>> --
>> Bjørn Ivar Teigen
>> Head of Research
>> +47 47335952 | bjorn at domos.no | www.domos.no
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> 
> 
> 
> -- 
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> 
> Dave Täht CEO, TekLibre, LLC
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