Public bug reported: -- Problem Description -- 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.
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 <[email protected]> Date: Wed Oct 15 12:42:58 2014 +0200 powerpc/vphn: NUMA node code expects big-endian ** Affects: ubuntu Importance: Undecided Status: New ** Tags: architecture-ppc64le bugnameltc-117090 severity-high targetmilestone-inin1404 ** Tags added: architecture-ppc64le bugnameltc-117090 severity-high targetmilestone-inin1404 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1401150 Title: Endianness issue in the VPHN topology update code To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1401150/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
