Public bug reported: [Impact] CONFIG_NUMA_BALANCING and CONFIG_NUMA_BALANCING_DEFAULT_ENABLED were both set to =y in hwe-x/hwe-y. This changed to =n in hwe-z, unintentionally as far as I can tell. This can lead to performance degradation on NUMA-based arm64 systems when processes migrate, and their memory accesses now suffer additional latency.
[Test Case] At a functional level: test -f /proc/sys/kernel/numabalancing Performance? [Regression Risk] ** Affects: linux (Ubuntu) Importance: Medium Assignee: dann frazier (dannf) Status: In Progress -- 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/1690914 Title: [Regression] NUMA_BALANCING disabled on arm64 Status in linux package in Ubuntu: In Progress Bug description: [Impact] CONFIG_NUMA_BALANCING and CONFIG_NUMA_BALANCING_DEFAULT_ENABLED were both set to =y in hwe-x/hwe-y. This changed to =n in hwe-z, unintentionally as far as I can tell. This can lead to performance degradation on NUMA-based arm64 systems when processes migrate, and their memory accesses now suffer additional latency. [Test Case] At a functional level: test -f /proc/sys/kernel/numabalancing Performance? [Regression Risk] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1690914/+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