Please add documentation for UDP

[MartinPulec]

Hello, would it be possible to add some documentation for the project? I've found eg. this. But it failed even in the simple case (interconnection is 10 GE with single switch between computers):

ntttcp -s -m 4,*,172.30.80.23 -t 10 -N
11:19:54 INFO:   throughput     :11.23Mbps

using '-N 300' (didn't have patience to wait till the end):
Real-time throughput: 0.00bps

I mainly want to test UDP performance Linux->Windows using current versions (5.36 and 1.4.0). Something like:

linux-sender $ ./nttcp -s -m 4,*,172.30.80.23 -t 10 -N -u -B 8G
C:\tools>Ntttcp.exe -r -m 4,*,172.30.80.23 -u -ns -l 9000

The main problem is that the receiver doesn't report any info, neither in TCP mode (-u removed). In UDP mode it only complains about buffer sizes - I didn't find how to set MTU on sender, interface has 9000 so -l 9000 may be sufficient on receiver. FW should be disabled for the process and TCP/UDP ports 5000-5100.

ERROR: StartSenderReceiver in thread: 2 failed: error in send/recv, GetLastError: 10040 - A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram into was smaller than the datagram itself.

So my question is simple - how do I simply measure the UDP performance between 2 computers with ntttcp, eg. in a manner as iperf does?

Thanks, Martin