[Starlink] dynamically adjusting cake to starlink

[Nathan Owens]

This one’s probably not a Mike question since the site doesn’t pull
anything from dishy. The dish represents all of its stats via gRPC - there
are several clients available. I can probably code this up next week if
someone doesn’t beat me to it.

—Nathan

On Wed, Jun 9, 2021 at 2:12 AM Dave Taht <davet at teklibre.net> wrote:

> Dear Mike:
>
> The biggest thing we need is something that can pull the right stats off
> the dishy and dynamically adjust cake (on outbound at least) to have the
> right amount of buffering for the available bandwidth, so as to make for
> better statistical multiplexing (FQ) and active queue management (AQM)
>
> It’s pretty simple: in mangled shell script syntax:
>
> while up, down = getstats()
> do
> tc qdisc change dev eth0 root cake bandwidth $up
> tc qdisc change dev ifb0 root cake bandwidth $down
> done
>
> Which any router directly in front of the dishy can do (which is what
> we’ve been doing)
>
> But whatever magic “getstats()” would need to do is unclear from the stats
> we get out of it, and a better alternative would be for the dishy itself
> and their headends to be doing this with “BQL" backpressure.
>
> As for the huge reductions of latency and jitter under working load, and a
> vast improvement in QoE - for what we’ve been able to achieve thus far, see
> appendix A here:
>
>
> https://docs.google.com/document/d/1rVGC-iNq2NZ0jk4f3IAiVUHz2S9O6P-F3vVZU2yBYtw/edit?usp=sharing
>
> We’ve got plenty more data
> on uploads and downloads and other forms of traffic (starlink is
> optimizing for ping, only, over ipv6. Sigh)…
>
> … and a meeting with some starlink execs at 11AM today.
>
> I’m pretty sure at this point we will be able to make a massive
> improvement in starlink’s network design very quickly, after that meeting.
>
> On Jun 8, 2021, at 2:54 PM, Nathan Owens <nathan at nathan.io> wrote:
>
> I invited Mike, the creator of the site (starlink.sx) to join the list -
> he’s put a crazy amount of work in to figure out which sats are active
> (with advice from Jonathan McDowell), programming GSO exclusion bands, etc.
> His dayjob is in the ISP business.
>
> On Sat, Jun 5, 2021 at 8:31 PM Darrell Budic <budic at onholyground.com>
> wrote:
>
>> https://starlink.sx if you have’t seen it yet. You can locate yourself,
>> and it will make some educated guesses about which satellite to which
>> ground station you’re using. Interesting to see the birds change and the
>> links move between ground stations, lots going on to make these things work.
>> _______________________________________________
>> Starlink mailing list
>> Starlink at lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/starlink
>>
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>
>
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