← Back to team overview

kernel-packages team mailing list archive

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


Also, we would like to collect some additional information about your
system. From a terminal, please run the following:

apport-collect 1321035

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  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.

To manage notifications about this bug go to: