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Working with Mellanox cards for a few weeks; the MTU matters a lot. The difference between an iperf test measuring 14 Gbits/s on MTU 1500 vs. 40 Gbits/s on MTU 9000.

We got a couple of Connect-X5 cards, which allow switchless connections, akin to a ring topology. A lot of neat things, at just stupid line speeds, and latency levels I haven't seen in software, ever.

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Interesting. I bought a "real" netgear switch a few years back (geared to the small business market) and did some tests with jumbo frames enabled, and saw only a slightly under 10% difference in performance pushing 10GB files from my laptop to my NAS.

Everything else was consumer level though. I did ensure that everything was flipped to jumbo frames. I/O shouldn't have been the factor since it was SSD on both sides.

Mellanox has some interesting stuff, I used to work with it back in my HFT days.

Not sure why this would be. Mellanox can do line rate on 40G at 1500 using dpdk easily.

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