On 12 August 2017 at 18:21, Raymond Burkholder <r...@oneunified.net> wrote:

> I have successfully run iperf bidirectionally in tcp as well as udp and hit
> link limits, even on smaller, lower capacity linux based boxes.

On what packet sizes? What link speeds? Linux UDP socket performance
is terrible, even with rescvmmsg sendmmsg which iperf does not
utilise, the performance is bad. XEON grade server CPU won't congest
1GE single dir - 1.48Mpps, without loss.
If you don't care/look at loss, or use low pps, it's different.

If you use TCP you're measuring the host stacks TCP implementation,
and you have no visibility on network quality, because packet loss is
hidden from you.

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