[Bloat] Still seeing bloat with a DOCSIS 3.1 modem

[Toke Høiland-Jørgensen]

Aaron Wood <woody77 at gmail.com> writes:

> I recently upgraded service from 150up, 10dn Mbps to xfinity's gigabit
> (with 35Mbps up) tier, and picked up a DOCSIS 3.1 modem to go with it.
>
> Flent test results are here:
> https://burntchrome.blogspot.com/2020/03/bufferbloat-with-comcast-gigabit-with.html
>
> tl/dr;  1000ms of upstream bufferbloat
>
> But it's DOCSIS 3.1, so why isn't PIE working?  Theory:  It's in DOCSIS 3.0
> upstream mode based on the status LEDs.  Hopefully it will go away if I can
> convince it to run in DOCSIS 3.1 mode.

I think that while PIE is "mandatory to implement" in DOCSIS 3.1, the
ISP still has to turn it on? So maybe yelling at them will work? (ha!)

> At the moment, however, my WRT1900AC isn't up to the task of dealing with
> these sorts of downstream rates.
>
> So I'm looking at the apu2, which from this post:
> https://forum.openwrt.org/t/comparative-throughput-testing-including-nat-sqm-wireguard-and-openvpn/44724
>
> Will certainly get most of the way there.

My Turris Omnia is doing fine on my 1Gbps connection (although that
hardly suffers from bloat, so I'm not doing any shaping; did try it
though, and it has no problem with running CAKE at 1Gbps).

-Toke