[Cake] cake infinite loop(?) with hfsc on one-armed router

[Toke Høiland-Jørgensen]

Pete Heist <pete at heistp.net> writes:

>> On Jan 6, 2019, at 9:56 PM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
>> 
>> Pete Heist <pete at heistp.net> writes:
>> 
>>> Lastly, is using cake as a leaf to htb risky until a fix is made? I’ve
>>> been doing that for a while without any apparent issues, though I’m
>>> hesitating now to try that in a production environment.
>> 
>> Hmm, that's a good question. I would expect so; but I would also expect
>> the issue to show up pretty much straight away, so if you haven't hit it
>> yet, I may be wrong. I'll do some more digging... Should probably also
>> try to replicate all this stuff on my own machine :)
>
>
> Ok, after what I’m seeing on my APU1 tests on 3.16.7, I’m definitely
> not putting split GSO into production. I just turned it on and off
> three times and here’s what I got:
>
> Split GSO on:
>
> https://www.heistp.net/downloads/htb_split_gso/htb_cake_split_gso.svg
> https://www.heistp.net/downloads/htb_split_gso/htb_cake_split_gso2.svg
> https://www.heistp.net/downloads/htb_split_gso/htb_cake_split_gso3.svg
>
> Split GSO off:
>
> https://www.heistp.net/downloads/htb_split_gso/htb_cake_no_split_gso.svg
> https://www.heistp.net/downloads/htb_split_gso/htb_cake_no_split_gso2.svg
> https://www.heistp.net/downloads/htb_split_gso/htb_cake_no_split_gso3.svg
>
> I’ve seen these square waves before with htb and wondered where they
> came from, and I think we may finally have an answer! What manner of
> thing causes this I don’t know, but there’s a chance you may end up
> finding out… :)

Is this without the patch to CAKE that adjusts the qlen? And have you
tried running with that patch (with HTB)?

-Toke