** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
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https://bugs.launchpad.net/bugs/1536837
Title:
Severe performance regression in Infiniband or IPoIB
Status in linux package in Ubuntu:
Triaged
Bug description:
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.
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