[Bug 1945819] Re: Octopus: Performance issue with HybridAllocator

[James Page]

As there is a workaround (switch to bitmap allocator) and the PR's are
all in flight upstream I'd prefer to allow the usual Ceph QA process to
run to completion and for these changes to be delivered as part of a
point release rather than being cherry picked into the Ubuntu packages.

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https://bugs.launchpad.net/bugs/1945819

Title:
  Octopus: Performance issue with HybridAllocator

Status in ceph package in Ubuntu:
  New

Bug description:
  Opening to track upstream issue https://tracker.ceph.com/issues/52804

  Issue is HybridAllocator tail latency observed in clusters with NVMe
  OSDs after upgrade to Octopus from Mimic.

  The allocator default was switched to "hybrid" from "bitmap" by
  upstream. Switching the OSDs back to the bitmap allocator removed the
  observed tail latency.

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