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What I wanna do

I want to know how accurate CBQ can split the bandwidth. You can do it on 2 different ways: you provide no weight parameter and uses the rates or you can provide a weight parameter.

Results

no weight parameter: traffic division = proportional to rates of classes (See tests with rate) but not so accurate as with the weight parameter
weight parameter: traffic division = proportional to weights of classes (See tests with weight parameter) but only accurate when the proportion of the rates you provide is smaller than the proportion of the weights.

Conclusion

If you want to split the traffic in different classes so the classes can borrow traffic from each other, create a bounded class with the total bandwidth, attach a qdisc on it and attach the classes who may share the bandwidth to this qdisc.

Overview

I made this overview from all the splitting-tests. For more explantation, visit the two splitting pages and read the conclusions.

Rates + no weight
- qdisc: OK (Splitting proportional to rates)
- NO qdisc
  - Filter : 10 - 10:2 - 10:10: Each class gets 50%
  - Filter : 10 - 10:10: Full bandwidth (no QOS)
Rates + weight
- qdisc: OK (Splitting proportional to weights)
- NO qdisc
  - Filter : 10 - 10:2 - 10:10: Each class gets 50%
  - Filter : 10 - 10:10: OK (Splitting proportional to rates)