I posted a message about using SQM & OpenWrt on Tom's Hardware, and got a 
response from someone who's somewhat knowledgeable. I'm not sure of the proper 
response, so I wanted to ask here first. Here's the question that has me 
stumped.

http://www.tomshardware.com/answers/id-2615979/high-latency-person-internet.html#15786081

My thoughts:

I know fq_codel takes control of the bottleneck by being set to a couple 
percent below the fastest link speeds observed in each direction.

The author of the rebuttal says that the (DSL or Cable) modem buffers will fill 
up if the "upload drops from 3 to 2mbps". I can think of two ways this can 
happen:
        - Actual link bit rate drops
        - Congestion/oversubscription in the head end causes effective data 
rate to drop

But I don't know enough about the physical characteristics of cable/dsl links 
to understand how they actually work, nor how fq_codel can (or can't) 
accommodate degradation.

Could someone help me shape a response? Thanks.

Rich


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