[Cake] Using cake to shape 1000’s of users.

Dave Taht dave.taht at gmail.com
Sat Jul 28 13:52:53 EDT 2018

On Sat, Jul 28, 2018 at 10:38 AM Pete Heist <pete at heistp.net> wrote:
> On Jul 28, 2018, at 10:56 AM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
> Note that with the existing tc classifier stuff we already added to
> Cake, we basically have this already (eBPF can map traffic to tin and
> flow however it pleases).
> Sorry, this just jostled in my brain now that I may be able to implement member fairness today, based on what you wrote earlier in a thread that I entirely missed: https://lists.bufferbloat.net/pipermail/cake/2018-May/003811.html
> George posted an example of assigning packets to a tin: https://lists.bufferbloat.net/pipermail/cake/2018-May/003809.html
> How does one send packets to a specific flow / queue?

It's essentially above. I think you can actually do it in pure bpf
without skbedit, I'd written a tc bpf flow classifier for acks quite
some time ago. The not current version is attached. I really need to
finish up some ack related stuff.
Using a bpf map to this then setting the flowid directly?

> This wouldn’t give both per-member and per-flow fairness, but at least per-member fairness might be possible. There are 1024(?) queues available and 800 members, so I’m just speculating that I could map members to a number from 0 to 800 (active member IDs packed and zero-based would work) and assign each member to their own flow. Thanks... :)
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Dave Täht
CEO, TekLibre, LLC
Tel: 1-669-226-2619
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