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[Bug 1321035] Missing required logs.


This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1321035

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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  Regression in Ubuntu w/ Intel 3.8 driver

Status in “linux” package in Ubuntu:

Bug description:
  We saw a regression of flow setup rate with Open vSwitch. For a single
  VM and one netperf session, previously we got  ~4000 connection per
  second. Now we can only get ~2500.  We saw this is only for Intel
  NICs. Broadcom NIC shows the same performance as before.

  The regression seems associated with the kernel. We are using Linux 3.2.0-61-generic. For default Intel NIC driver is 3.6.7-k, if we want to upgrade the intel driver to support UDP rx-flow-hash, we need to install: linux-backports-modules-net-3.2.0-61-generic
  After updating the Intel driver to 3.8.21-NAPI, we got ~2500 cps for flow setup rate with one session in one vm.  So I purged "linux-backports-modules-net-3.2.0-61-generic" and used the default Intel driver. Then the flow setup rate gets back to ~4000 tps. 

  With the linux-backports-module-net-3.2.0-58-generic, we saw no such
  regression with either Intel driver.

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