What is the mq qdisc in tc Traffic Control?

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Issue

What is the mq qdisc (queuing discipline) in tc Traffic Control?
How does Linux send packets to NICs with multiple transmit interrupt queues?
Does the kernel use more than one Tx channel on multi-queue network interfaces?

Environment

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Network interface card (NIC) with multiple hardware transmit interrupt channels
Default Linux queuing discipline mq qdisc

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