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Old 10-19-2007, 10:06 PM   #1
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Registered: Aug 2007
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kernel: qdisc with PRIO map


I am having trouble with the linux qdisc behavior. I configured a PRIO qdisc with three PFIFO sub-qdisc. To my understanding, if there is no Filter or no filter match in a qdisc, the default PrioMap will be used to classify the traffic, at least according to the documentation.

But what I saw is in real experiment is that the PrioMap is ignored and traffic is treated as best-effort. Therefore it is always put into band 1, the medium priority queue. But I have made sure that the egressing traffic is with a TOS byte of 0x08, which should have resulted in band 2, the lowest priority queue.

I also looked the source code in the scheduler. The code seems to match the behavior, not the documentation.

Any clue about this issue? Am I missing something?




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