LAN/NIC problem

[MarkHaysHarris777]

So longlseeps ubuntu image is the one that offers the best out-of-the-box experience/configuration.

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But if you now compare longsleep's original Ubuntu image and your Armbian Jessie installation then longsleep's will show better performance as long as you rely on iperf3. Why? Since iperf/iperf3 are CPU bound and act in Xenial in one mode multi-threaded while on Jessie single-threaded and therefore Jessie will show lower numbers.

The whole iperf/iperf3 game played here is not taking into account what iperf/iperf3 are primarily measuring: CPU performance. If you want to test network instead you need to ensure that the other host is beefy enough to always exceed 935 Mbits/sec, it this is not the case then you always get random results.

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I can affirm the above also.  I'm using the T61 ThankPad (AC Power) for the iperf|iperf3 host. The ubuntu image running on the good board easily gets double the speed numbers up into the low to mid 800(s) while the debian image on the same board rarely gets above the mid 400(s). Also, the ubuntu image has less random numbers than the debian image.  Tomorrow I'll play around with the 'performance' governor.