[Bloat] CAKE in openwrt high CPU

[Toke Høiland-Jørgensen]

On 3 September 2020 17:31:07 CEST, Luca Muscariello <muscariello at ieee.org> wrote:
>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.

Eiffel says it can do shaping by way of a global calendar queue... Planning to put that to the test :)

-Toke