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By default Linux creates a qdisc mq. I am configuring it on my computer to change some parameters but I found that there are 2 qdiscs that seem to be the same: mq and multiq.

I can't find any documentation on what the differences are between them to know which one to use.

The only thing I have been able to verify is that mq detects 2 transmission channels while multiq detects 8 for the same device.

In https://github.com/torvalds/linux/blob/master/net/sched/Kconfig specifies multiq but not mq.

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I've been trying to figure out the same thing, I think the docs just aren't very good....

Not sure if I got this right, but this is what I figured out:

  • mq exposes multiple hardware queues (when the hardware supports it, which most modern hardware does)
  • multiq creates multiple queues in software, on top of a single hardware queue. This would supposedly help because each software queue would then have its own qdisc lock.
  • There is also mqprio, which seems to expose hardware queues like mq does, but also configure how the hardware allocates bandwidth between the queues.

I wish there were more examples around showing how these features are supposed to be used.

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