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Awesome work. Been watching your videos on these (the video card one was especially interesting).

At what point are you saturating the poor little ARM CPU (or its tiny PCIe interface)?

Heh, I know that ~3 Gbps is the maximum you can get through the PCIe interface (x1, PCI 2.0), so that is expected. But I was hoping the internal ethernet interface was separate and could add one 1 Gbps more... the CPU didn't seem to be maxed out and was also not overheating at the time (especially not with my 12" fan blasting on it).

with some tuning you should be able to saturate the PCIe 1x slot.

Excellent reading on this available here :

http://www.intel.com/content/dam/doc/application-note/82575-...

and here :

https://blog.cloudflare.com/how-to-achieve-low-latency/

Edit : with the inbound 10Gb card referenced

Was all this TCP? You might try UDP as well, in case you're hitting a bottleneck in the tcp stack.

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