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 [0] https://wiki.ubuntu.com/Kernel/LTSEnablementStack#A12.04.4_.2B_13.10_Hardware_Enablement_Stack_Policies_and_Procedures ** Changed in: linux (Ubuntu) Importance: Medium => High -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1321035/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
