** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Zesty)
Status: New => In Progress
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Zesty)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1690914
Title:
[Regression] NUMA_BALANCING disabled on arm64
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Zesty:
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]
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