Pardon me if this is too elementary a question. But I am not sure how to see the length of a queue on an interface. I have changed the qdisc configuration from default pfifo_fast to pfifo to get

statistics. All I see though is a report on backlog.

The output I see is like this:

Sent 938609238 bytes 780809 pkt (dropped 0, overlimits 0 requeues 0)

backlog 0b 0p requeues 0

I do not know if this backlog is indeed queue length or not. It seems strange to be queue length, because even when I flood the network with high UDP data rates over capacity, it still shows 0b of backlog. Am I looking at the wrong parameter? If so, could you please point out the tool that shows the instantaneous queue length?

Thanks a lot