[Cake] tossing acks into the background queue

[Toke Høiland-Jørgensen]

>> And either way, CAKE is still going to be limited by being single core
>> only, and fixing that requires some serious surgery that I seem to
>> recall looking into and giving up at some point :(
>
> 	That is sad, and pretty much rules out that I could make some
> 	progress in that direction. The next level is shaping at ~1Gbps,
> 	even though faster access links become available, like 8.5/10
> 	Gbps (XGS-PON is nominally 10G, but after FEC only ~8.5 Gbps
> 	actually are usable) or for a lucky few even 25 Gbps ...

Yup. FWIW my hope is that we'll be able to do something about this using
XDP, eventually... :)

-Toke