Public bug reported: When upgrading to the latest 4.4 test kernel from mainline development, all IPoIB links showed a severe performance regression as compared with kernel 4.2. The bandwidth of each link dropped from around 3Gbps to around 3Mbps (3 orders of magnitude worse!); reverting to the 4.2 kernel immediately fixed this problem.
The 4.3 kernel from Debian does not appear to suffer from this regression. The regression shows up on both IB ports of the Mellanox MT25208 controller. Other hardware has not been tested. ** Affects: ubuntu Importance: Undecided Status: New ** Tags: regression-proposed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1536837 Title: Severe performance regression in Infiniband or IPoIB To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1536837/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs