[Cake] issue with Cake and bpf filter

[Jonathan Morton]

> On 22 Aug, 2018, at 12:06 am, Pete Heist <pete at heistp.net> wrote:
> 
> when fq_codel is the qdisc, the eBPF action is only called "once in a while”

One difference between fq_codel and Cake is that the former - which has no shaper - will "bypass" packets when it's empty and there's no back-pressure filling it.  In that case no packet classification occurs and filters will not be called.  Or at least, that's how it used to be set up; I haven't looked at it recently.  Cake does not rely on the same set of assumptions, so will always call the filter.

 - Jonathan Morton