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

[Mauricio Faria de Oliveira]

Backport PRs:

- pacific: os/bluestore/AvlAllocator: introduce bluestore_avl_alloc_ff_max_* options #43745 
[1] https://github.com/ceph/ceph/pull/43745

- octopus: os/bluestore/AvlAllocator: introduce bluestore_avl_alloc_ff_max_* options #43747 
[2] https://github.com/ceph/ceph/pull/43747

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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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