Also noticed something weird when I switched from my ESXi 4.1 test install to a 5.1 install. After getting the drivers installed, it connected to the infiniband network at 4x, however, when I enabled the 4k mtu and restarted, it was setting itself to 1x. Things seem to be working now, but I haven't run any tests yet to see what my data transfer performance is like yet.
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