Your gues is right. To get HTB work correctly you must know rate parameter for your connection also known as CIR. Coud you tell what minimum rate your clients have?
My worst HTB class has rate&ceil 778bps.
I guess the lower the rate, the less accurate the result. It can't be accurate, because the class already exceeds it's limit by sending just one single packet.
Maybe it's more accurate in the long run, but I don't have any statistics to prove that. Anyway, the traffic for that class is damn slow, and that's all I need to know. ;-)
Andreas
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