DCTCP behavior

[mike4612]

In DCTCP, I think that the red-queue-disc is used to put the ECN mark．

When using the red-queue-disc, when sending a packet, I think the packet passes the drop-tail-queue after passing the red-queue-disc between the second and third layers (traffic-control-layer). (I'm sorry if my recognition is wrong)

At this time, if you change the queue length of drop-tail-queue, The behavior when using DCTCP changes. Is this normal?

What is the buffer size of queue-disc and drop-tail-queue, respectively, in order to operate in the same way as the paper in DCTCP?

Thanking you in advance．