** Package changed: ubuntu => linux (Ubuntu) ** Changed in: linux (Ubuntu) Importance: Undecided => Medium
** Tags added: kernel-da-key precise -- 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: New 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 : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
