Hi,
I think it's acceptable that the queue length is around 20 or something else, which means I can process the queue delay data, I tried multiple udp intervals,from 1s to 0.001s. The queue length is either 1 and 0, and in this case the queue delay is very small(can be ignored?), or a lot of packet loss(about 90 packet loss rate), I don't know if my thinking is correct? Continue to try other intervals or can the queue delay be obtained by other methods?
I think the queue is processing too fast and the packets can't pile up yet. So I can't get the queue delay when there is slight congestion.