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
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https://bugs.launchpad.net/bugs/1536837
Title:
Severe performance regression in Infiniband or IPoIB
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