Ironically, we made fq-codel the default in many linuxes starting in 2012. HTB will pick up the default qdisc when you set that, so we figured many small shapin

Ironically, we made fq-codel the default in many linuxes starting in 2012. HTB will pick up the default qdisc when you set that, so we figured many small shaping tools were just picking that up automagically. Most people do not measure in-stream latency, rather multiple streams, so, assuming you did or did not pick up fq_codel, a packet capture will show you the tcp RTTs being managed or not. Note that on a system where the tcp is originating and then transitioning htb on the same box, another subsystem (TSQ) managed the rates fairly well before hitting HTB.