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[Gary Gaydos <1291660@xxxxxxxxxxxxxxxxxx>]

See the above three log files, 2 with iperf and 1 with netperf.

iperf is equivalent between 3.11.0-15-generic and 3.13.6 upstream kernel
when running point to point (no switch).  TCP stream is as expected.
UDP stream is poor in both cases.

netstat results are significantly different than iperf results.  The
netstat test run is also point to point (no switch).

Let me know if you'd like me to perform additional tests.

Gary

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https://bugs.launchpad.net/bugs/1291660

Title:
  Intel ixgbe driver doesn't work at 10Gb speeds

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I have a fresh install of 12.04.4 on an IBM server with an Intel 10GbE
  card (actually I have seen this on TWO systems, one with a PCIe 10GbE
  card and one with a mezzanine add-in card that has the same chipset).

  12.04.4 ships with ixgbe version 3.13.10-k

  Initially, when the ethernet device comes up, it sets itself at 1Gb
  not 10Gb.  If you do an ethtool on one of the devices, they clearly
  show supported speeds of 100, 1000 and 10000Mb/s as well as advertised
  speeds of that nature.

  Also, ethtool clearly shows the current speed at 1000 .

  now, if you force the card to a speed of 10000 like so:

  sudo ethtool -s eth0 speed 10000 duplex full

  Ethtool will NOW show "Unknown!" for speed and duplex settings, and
  will drop the link.

  The link will restore, as will the rest of the output, if you put the
  card back to the 1000Mb/s speed.

  Thus, the ixgbe driver seems to be broken.

  I tried to use apport to file this bug, however apport told me that
  the linux and linux-image-generic packages are NOT official Ubuntu
  packages, and refused to create the report for me.

  Thus, I gathered what i could via sosreport and some other means,
  which I am attaching below.

  This will gate any certification that uses the Intel 10Gb NICs (seen
  onboard at least a couple server systems now).

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