Then, if prioritized packed arrives when FIFO is not empty, it will not be allowed to go out before packets without ipprecedence that are already in FIFO. That's bad.
That's not quite right. The prioritized packet will presumably be handled by a different (dummynet) queue, and that queue will have a higher weight than the other queue (for lower priority traffic).
Luigi will correct me if I'm wrong, but it's probably important to keep the high-priority VoIP queue small -- either in bytes or packets, representing the actual bandwidth. This will cause he WFQ to kick in.
Because of fairness, it won't *prevent* low-priority packets from being transmitted -- and that's important, since queueing systems can suffer horrible locks from a small amount of traffic otherwise -- but it should accomplish your goal.
Tuning is your job, though, Zhenya. ;-)
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