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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1321035

Title:
  Regression in Ubuntu 3.2.0.61 w/ Intel 3.8 driver

Status in “linux” package in Ubuntu:
  Incomplete

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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