[Cake] bufferbloat still misunderstood & ignored

Toke Høiland-Jørgensen toke at toke.dk
Sat Mar 31 06:55:16 EDT 2018

Jonathan Morton <chromatix99 at gmail.com> writes:

>> 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.

Even better, you can do arbitrary programmable matching these days,
using tc-bpf(8). Theoretically FQ-CoDel supports this in place of the
built-in flow hashing; but I have never managed to get it configured
correctly (haven't tried that hard, though).


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