tc and priority

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Hi all,
I'm studying traffic shaping and I need some informations.
I studied HTB and I had no problem to limit bandwidth (with and without borrowing). Then I would undestand how assign different priorities to packets: I test qdisc PRIO and prio paramenter in CBQ (and HTB) but without success.

with CBQ, I create 2 two classes with different priority and I filter traffic to send different traffic (source port) to a particular queue. Then I run 2 connections having different priority and I see that a connection stalls and the other uses all bandwidth then it succeeds the opposite.

The same behaviour I see using PRIO qdisc.

Instead, I would get that che higher priority connection uses all bandwidth until its queue is full (so che lower priority connection waits until the other finish).
What's wrong? Suggestions?

Thanks,
Fabio
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