[Cake] bufferbloat still misunderstood & ignored

[Jonathan Morton]

> On 30 Mar, 2018, at 11:05 am, Pete Heist <pete at eventide.io> wrote:
> 
> So this mapping from member (subscriber) to their MACs or IPs would need to be configurable somewhere

Yes, I assumed something like that would be required to assign the correct tier of service (or BRAS rate) to each subscriber, and that's what makes it ISP-focused rather than end-user focused.

In Linux it appears to be possible to assign a flow mark (ie. a number) to packets using firewall rules or qdisc filters, and the subscriber ID and tier ID could probably be encoded into that.  It would then only be necessary to inform the qdisc of this encoding (how many bits for each portion) and to define the tiers.

It would also probably be more appropriate to give an ISP-focused qdisc a sysfs configuration/stats interface with more flexibility than an iproute2 interface.  I still think Cake works fine with iproute2 alone.

 - Jonathan Morton