A note on Linux QoS using tc-htb and fq_codel - it won't actually shape traffic until you add "noecn". The manual says the default is dropping packets but this has apparently changed - by default it will send ECN, which is a kind suggestion to the sender to slow down.

So this trivial tc script gets me all A's in DSLReports speedtest - previously it was C on buffer bloat (which hurts latency)