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

[Dave Taht]

another answer is to disable gro/tso in the driver via ethtool.

On Sun, Jan 6, 2019 at 4:30 PM Pete Heist <pete at heistp.net> wrote:
>
>
> > 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… :)
>
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-- 

Dave Täht
CTO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-831-205-9740