Have other users also observed that with the vmxnet3 driver provided with Linux Kernel 4.1, when running on an ESXi 6, there is a potentially very high number of RX errors and packet loss. As a result the network is unusable for high speed/volume transfers. Reverting to a 3.X kernel solved the problem. I do not have kernel knowledge to investigate this issue. I will try at a later stage if the other virtual adapters have the same issue or not.
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