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


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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.

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: New

** Tags: bot-comment
Regression in Ubuntu w/ Intel 3.8 driver
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