What is the txqueuelen parameter measured in?

Question

linux

In what units? And what happens if there is a large packet that will be larger than the txqueuelen parameter?

Answer 1

In units of Ethernet frames. The size of each frame is limited by the MTU value. If the queue is full, write() on a blocking socket will wait until the queue is free, on a non-blocking socket it will throw an EWOULDBLOCK error