3 Replies Latest reply on Aug 1, 2017 3:51 AM by zhangsuo

    Low (weird) throughput with ConnectX-3


      Dear all,


      I have a problem when receiving traffic with Mellanox ConnectX-3 VPI (dual 40Gbps ports).


      Problem description: I connect the two 40G ports to tow traffic generator (shown as below). When G#1 sends traffic (128B packets), port 1 of the server can receive packets with 28Gbps. However, while G#2 send traffic to port 2 concurrently, the traffic speed of port 1 becomes 14Gbps and that of port 2 is also 14Gbps.

      Naturally, the total traffic of two ports should be 56Gbps (28 * 2), not be divided 14Gbps per port.


      So, Is there a reasonable comment about this problem, or is there some problem in my system setting?


      Additional information: I have tuned performance guided by the document(https://community.mellanox.com/docs/DOC-2489#jive_content_id_Getting_started ) and my PCI-E speed is 8GB (PCI-E 3.0 8x).



      Can anyone help me with this problem?


      Many thanks,