I'm trying to figure out what is causing iperf UDP test to some kind
of 'flow controlled' with the new Fedora 18/Kernel 3.x.
I tested with the same iperf v2.0.5, same command on the client side:
iperf -c _server_ip_addr -u -b 4000m -i 1
With Fedora 14, the client side shows 4Gbps of packets are pushed to
the driver and the server side shows huge packet loss. With Fedora
18, the client side seems automatically adjusts its TX rate to the
capacity of the link and the server side shows almost 0 packet loss.
I'm very curious what is changed between Fedora 14 and Fedora 18 to
give UDP such a different behaviour, and is it the future of UDP implementation?
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