Here is at least one discussion from 2010:

I remember seeing a few others across the ages.... Use various archives / search engines / search keywords?

2014-08-22 9:20 GMT+01:00 Martin T <>:
Thanks for the reply! I'll check the receiving side. Could you please
point me to an article/discussion describing the blocking- and
non-blocking NIC drivers? I didn't find it from iperf-users mailing