Does anyone have a standalone UDP sender application ?

[tjcw]

I am trying to evaluate using AF_XDP and a user-space application for packet filtering. Using iperf3 to generate udp packets flowing between namespaces on a VM gives me a data rate of about 2.5 Gbit/s , which is roughly the same as I get using iperf with tcp. I was expecting a higher data rate with udp since in this case tcp will be doing software checksums. This makes me think that iperf3 is doing some processing on the udp send path that I do not need to be done. So I think I need a standalone udp sender application which I can tweak to optimise the data rate. Does anyone have such a thing, to save me the effort of writing one ?