[p1mrx]

Followup: I just tested OpenWrt 23.05.2 + luci-app-sqm + cake with https://speed.cloudflare.com/

With the limit set to 1 Mbps (1000/1000), my upload latency dropped from 80ms to 25ms, but speed was hard-limited to 1000/1000. With the limit rasied to 1G/1G, cake stopped working and my upload latency returned to 80ms.

So I stand by my original comment. You still have to configure the speed limits manually.

[wtallis]

You're right: CoDel and derivatives like fq_codel and cake don't auto-tune anything on timescales much longer than the interval parameter which defaults to 100ms. And fq_codel doesn't even do traffic shaping.

But I think davecb may have been confusing traffic shaper limits with TCP congestion control behaviors, and maybe the impact of a large TCP initial window releasing a sudden burst of packets that may be large enough to build up a bit of a queue on particularly slow links. (It was a serious problem in the ADSL era; now, only wireless gets that slow, and large bursts of packets are as likely to help as not when frame aggregation enters the picture.)