4 ms·
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
by cremp 8y ago
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.
- kevstev 8y agoInteresting. 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.
- shaklee3 8y agoNot sure why this would be. Mellanox can do line rate on 40G at 1500 using dpdk easily.