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

[Jonathan Morton]

>> 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?

The trouble here is that there's only 8 tins max in Cake.  At that level selection is done with a linear search, which doesn't scale up, but is efficient for N=8.  The host/flow mapping is hardcoded for speed with no override hook, because no consumer needs custom mapping of this sort.

Fixing these problems to make them more ISP-friendly necessarily makes it less consumer-friendly.  Hence the new project.  Much code can be reused.

 - Jonathan Morton