high commit_latency and apply_latency

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we have a cluster with very low load, however, "ceph osd perf" shows high commit_latency and apply_latency.


root@stor-mgt01:~# ceph -s
  cluster:
    id:     3d1ec789-829d-4e0f-b707-9363356a68f1
    health: HEALTH_WARN
            application not enabled on 3 pool(s)
 
  services:
    mon: 3 daemons, quorum a,b,c
    mgr: a(active)
    mds: rook-ceph-filesystem-1/1/1 up  {0=rook-ceph-filesystem-a=up:active}, 1 up:standby-replay
    osd: 55 osds: 55 up, 55 in
    rgw: 3 daemons active
 
  data:
    pools:   18 pools, 3328 pgs
    objects: 1.06M objects, 1.37TiB
    usage:   4.18TiB used, 141TiB / 145TiB avail
    pgs:     3328 active+clean
 
  io:
    client:   46.2KiB/s rd, 2.58MiB/s wr, 197op/s rd, 273op/s wr


----------------------------------------------------------------------------------------

osd commit_latency(ms) apply_latency(ms) 
 54                  0                 0 
 53                  0                 0 
 52                  0                 0 
 51                  0                 0 
 50                  0                 0 
 49                 11                11 
 48                  9                 9 
 47                  3                 3 
 46                 39                39 
 21                 28                28 
 20                 26                26 
 19                 28                28 
 18                  1                 1 
 17                 17                17 
 16                  6                 6 
 15                 11                11 
 14                  9                 9 
 13                  8                 8 
 12                 12                12 
 11                 14                14 
 10                 21                21 
  0                 10                10 
  1                 12                12 
  2                 30                30 
  3                  3                 3 
  4                  3                 3 
  5                 23                23 
  6                 56                56 
  7                  2                 2 
  8                 36                36 
  9                  5                 5 
 22                 26                26 
 23                  3                 3 
 24                  2                 2 
 25                  3                 3 
 26                 19                19 
 27                  3                 3 
 28                  4                 4 
 29                  8                 8 
 30                 16                16 
 31                 21                21 
 32                 13                13 
 33                  7                 7 
 34                 10                10 
 35                 12                12 
 36                  5                 5 
 37                  5                 5 
 38                  4                 4 
 39                 29                29 
 40                 26                26 
 41                 35                35 
 42                  5                 5 
 43                  4                 4 
 44                  8                 8 
 45                  6                 6
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