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[Bug 1536837] [NEW] Severe performance regression in Infiniband or IPoIB

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1536837@xxxxxxxxxxxxxxxxxx>
Date: Fri, 22 Jan 2016 16:18:53 -0000
Reply-to: Bug 1536837 <1536837@xxxxxxxxxxxxxxxxxx>
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You have been subscribed to a public bug:

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: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
Severe performance regression in Infiniband or IPoIB
https://bugs.launchpad.net/bugs/1536837
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