I used the default MTU and did not make any change to it.
Also I used iperf to send UDP, no problem is found to run the following script on MC7430 with FW SWI9X30C_02.36.00.00 on Ubuntu 18 with kernel version 4.13.
while true; do
date
sudo iperf -u -c 116.66.221.43 -p 5050 -b 10M
done
Attached log2.txt is the log for this experiment.
log2.txt (115.9 KB)