[mhandley]

I can think of ways to approximate FQ on an input-queued switch while maintaining performance, but it doesn't really help because the total number of queues being a function of the traffic still opens you up to resource exhaustion attacks.

[muxamilian]

Fair queuing shouldn't be necessary in the core. If every base station/WiFi router/client device support fair queuing that should be enough.

[dtaht]

I think FQ helps everywhere, and FQ + aqm is needed at every fast->slow transition on the network. Ideally the core is over provisioned... except where it is not.