Hi,
I have two HCA cards, each having two ports and each connected to a separate PCI-E x8 slot.
Using one HCA port I get end to end BW of 11.6 Gb/sec (uni-direction RDMA).
If I use two ports of the same HCA or different HCA, I get between 5 to 6.5 Gb/sec point-to-point BW on each port. BW on each port further reduces if I use more ports. I am not able to understand this behaviour. Is there any limitation on max. BW that a system can provide? Does the available BW get divided among multiple HCA ports (which means having multiple ports will not increase the BW)?
Regards,
John T
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