kernel-packages team mailing list archive

Thread
Date

[Bug 1536837] Re: Severe performance regression in Infiniband or IPoIB

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Mon, 22 Feb 2016 20:47:23 -0000
Reply-to: Bug 1536837 <1536837@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: linux (Ubuntu)
       Status: Incomplete => Triaged

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1536837/+subscriptions