This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- trusty' to 'verification-done-trusty'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-trusty ** Tags added: verification-needed-utopic -- 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/1401150 Title: Endianness issue in the VPHN topology update code Status in linux package in Ubuntu: Fix Released Status in linux source package in Trusty: Fix Committed Status in linux source package in Utopic: Fix Committed Bug description: SRU Justification: [Impact] The current VPHN code assumes the NUMA toplogy updates data are big endian. They are native endian actually since the hypervisor pass them through registers. This has a great performance impact on little endian guests. [Test Case] Install NUMA capable power8 machine in LE mode, install LE guest. Measure performance differences in LE guest after applying this patch. [Fix] commit 5c9fb1899400096c6818181c525897a31d57e488 upstream in v3.18-rc2 A fix has been sent to fix the issue: http://patchwork.ozlabs.org/patch/396171/ Please pick the following commit from Michael Ellermans's tree: http://git.kernel.org/cgit/linux/kernel/git/mpe/linux.git/commit/?id=5c9fb1899400096c6818181c525897a31d57e488 which reads: "powerpc/vphn: NUMA node code expects big-endian" Now upstream: commit 5c9fb1899400096c6818181c525897a31d57e488 Author: Greg Kurz <gk...@linux.vnet.ibm.com> Date: Wed Oct 15 12:42:58 2014 +0200 powerpc/vphn: NUMA node code expects big-endian To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1401150/+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
