[Bloat] CAKE in openwrt high CPU

[Luca Muscariello]

On Thu, Sep 3, 2020 at 4:32 PM Toke Høiland-Jørgensen <toke at toke.dk> wrote:
>
> Luca Muscariello <muscariello at ieee.org> writes:
>
> > On Thu, Sep 3, 2020 at 3:19 PM Mikael Abrahamsson via Bloat
> > <bloat at lists.bufferbloat.net> wrote:
> >>
> >> On Tue, 1 Sep 2020, Toke Høiland-Jørgensen wrote:
> >>
> >> > Yup, the number of cores is only going to go up, so for CAKE to stay
> >> > relevant it'll need to be able to take advantage of this eventually :)
> >>
> >> https://www.hardkernel.com/shop/odroid-h2plus/ is an interesting platform,
> >> it has a quad core machine with 2 x 2.5GbE NICs.
> >>
> >> When using something like this for routing with HTB+CAKE for bidirectional
> >> shaping below line rate, what would be the main things that would need to
> >> be improved?
> >
> > IMO, hardware offloading for shaping, beyond this specific platform.
> > I ignore if there is any roadmap with that objective.
>
> Yeah, offloading of some sort is another option, but I consider that
> outside of the "CAKE stays relevant" territory, since that will most
> likely involve an entirely programmable packet scheduler. There was some
> discussion of adding such a qdisc to Linux at LPC[0]. The Eiffel[1]
> algorithm seems promising.
>
> -Toke
>
> [0] https://linuxplumbersconf.org/event/7/contributions/679/
> [1] https://www.usenix.org/conference/nsdi19/presentation/saeed

These are all interesting efforts for scheduling but orthogonal to shaping
and not going to help make shaping more scalable.