Rich, One thing that helped considerably on my my DSL link (21000/1200), was turning on the Link Layer Adaptation. With that, and efq_codel, I've been very happy with the (nearly non-existent) latency. Yeah, I lost a couple percent off the top, but the behavior is better. Although I was starting from a much better base given that Free.fr's DSL modems already using either fq_codel or RED (I'm not sure the specifics, but I think Dave Taht's gotten them from Free.fr in the past).
Dave, the 40ms target is the buffer latency target? or how often the drop rates are recomputed? -Aaron
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