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[Bug 1321035] Re: Regression in Ubuntu w/ Intel 3.8 driver


Would it be possible for you to test the Trusty HWE stack[0] in Precise
and see if it also exhibits this bug?  The Trusty HWE stack can be
install with:

sudo apt-get install --install-recommends linux-generic-lts-trusty

If the bug does not exist in the Trusty HWE stack, one option would be
to potentially just ride that Trusty stack in Precise.  The other option
would be for us to perform a reverse bisect to identify the fix and then
backport it.

Thanks in advance


** Changed in: linux (Ubuntu)
   Importance: Medium => High

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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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