I have 2 box, 1 linux and 1 windows. Both box have an aoc-stgn-i2s. They are connected via DAC.
I will run iperf -s on the windows box, then run iperf -c <$10ge-ip-addr> on the linux box.
On the windows box I set both interface mtu to 9000 and enable jumbo frames. Double checked with netsh interface ipv4 show subinterface to make sure it is indeed 9000. Restarted as well.
test1: Linux 10ge interface mtu as 1500. Avg is 6.3Gbits/sec over 10 test.
test2: Set linux 10ge interface mtu to 9000 via ip link set dev p1p2 mtu 9000. Avg is around 4.48 Gbits/sec.
The above two test have been conducted a dozen of times to confirm the averages. Why does mtu 1500 yield higher results than mtu 9000? How can I tweak my boxes to get my desire 8~9 Gbits/sec?
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