|Linux Advanced Routing & Traffic Control HOWTO|
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These classless queues are even simpler than pfifo_fast in that they lack the internal bands - all traffic is really equal. They have one important benefit though, they have some statistics. So even if you don't need shaping or prioritizing, you can use this qdisc to determine the backlog on your interface.
pfifo has a length measured in packets, bfifo in bytes.