[Bloat] Bloat goes away, but with ~25% speed loss?

[Rich Brown]

I'm supporting people re: SQM/fq_codel on some of the boards, and came across a refractory problem, and I'd like to get some advice.

Summary: A person is using OpenWrt 14.07 (same code base as CeroWrt 3.10.50-1) and SQM. Turning on SQM decreases, but doesn't eliminate, bufferbloat. They also lose a significant fraction of their bandwidth (from ~12-13 mbps down to ~9-10mpbs down, with similar decrease on the upload side).

Original report: http://www.techsupportforum.com/forums/f31/bufferbloat-wont-go-away-997842.html 

- I have confirmed that it's set up right and that there doesn't seem to be any other shaping in play. 

- Also, the ISP has confirmed that the tower involved does get overloaded, but I'm not sure how that would affect the SQM rates while leaving unchanged the unshaped measurements...

What other thoughts/advice could I offer? Thanks!

Rich