[dtaht99]

There were long debates about continuing to use the term QOS for what we did with htb + fq_codel. From: https://www.bufferbloat.net/projects/cerowrt/wiki/Smart_Queu...

“SQM” is shorthand for an integrated network system that performs better per-packet/per flow network scheduling, active queue length management (AQM), traffic shaping/rate limiting, and QoS (prioritization).

“Classic” QoS does prioritization only.

“Classic” AQM manages queue lengths only.

“Classic” packet scheduling does some form of fair queuing only.

“Classic” traffic shaping and policing sets hard limits on queue lengths and transfer rates

“Classic” rate limiting sets hard limits on network speeds.

It has become apparent that in order to ensure a good internet experience all of these techniques need to be combined and used as an integrated whole, and also represented as such to end-users."

[Rapzid]

QoS Classic.. A total branding excercise. All of these strategies were deployed in the past under the umbrella term "QoS".