New: Severe IPoIB Routed Performance Regression

https://bugzilla.kernel.org/show_bug.cgi?id=111921

            Bug ID: 111921
           Summary: Severe IPoIB Routed Performance Regression
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Infiniband/RDMA
          Assignee: drivers_infiniband-rdma-ztI5WcYan/[email protected]
          Reporter: [email protected]
        Regression: No

(Apologies if this is in the wrong section)

There appears to be a significant performance regression somewhere in the Infiniband or IPoIB stack starting with kernel 4.4. IP performance over the infiniband network itself is fine, however I have my internet connection routed from my ethernet network to my infiniband network. In kernel versions up through 4.3.3, this worked fine and provided my ISP line speed of ~180Mbps over IB. However in 4.4 this has dropped over an order of magnitude and I can now only achieve ~5Mbps when traversing from ethernet to infiniband or vice versa. I'm running IPoIB in connected mode.

Reference: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1536837

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