• Source Code
• Buffer Bloat

Explanations for the average person:

• This Video: YT 41minutes at Time point ~ 21:00 explains CoDel
• it also explains Fair Queue CoDel
• but is does not explain HFSC!!!

• measure the latency in the queue (from ingress to egress, via time stamping on entry and checking the timestamp on exit
• when latency exceeds tartget, think about dropping a packet
• after latency exceeds target, drop a packet at the HEAD of the queue (not the tail!)
• if that does not fix it, after a shorter interval (inverse sqrt), drop the net packet sooner, again at the HEAD
• keep decreasing the interval between drops until the latency in the queue drops below target
• we start with 100ms at the interval of the estimate and 5ms as the target (for 4Mbit/s and up) 10Gbig/s needs a smaller target.
• below 4Mbit/s … well, we don't know