[Cake] Cake throughput levels off during longs tests

[Toke Høiland-Jørgensen]

So I ran a couple of tests of Cake on the Archer-c7 on newest openwrt
trunk with sqm-scripts set to 30/30 Mbps. The attached graphs are the
result of equivalent fq_codel and cake settings.

As you can see, the cake throughput levels off over long test durations.
Anyone has any idea why?

-Toke

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