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Both enqueuing and dequeuing of packets is accomplished using decision making apparatus and congestion avoidance and dequeue management hardware.
You can use the Dequeue function to remove a queue element directly from an operating-system queue or from a queue that you have created.
Note that dequeueing a message with any of the dequeue methods will not preserve the message grouping property.
Each class must have a queuing discipline to determine how packets are enqueued and dequeued .
Basically, its operation is pretty simple: it just dequeues the first packet from the current CPU's queue and runs through the two lists of packet handlers, calling the relevant processing functions.