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High CPU utilization due to HostOS domain process FPolicy

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • HostOS Utilization

Issue

  • High CPU on one node.
  • FPolicy is not configured.
  • Running sysstat -M shows high host domain utilization compared to other domains:
AVG CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7  Nwk_Lg Nwk_Exmpt Storage Raid  WAFL_Ex(Kahu)  Exempt SSAN_Ex Intr Host Ops/s 
65%  47%  43%  45%  75%  67%  75%  67%  71%     15%       10%     15%   4%    211%( 14%)    180%    161%   5% 335%   8911   
84%  73%  74%  76%  87%  86%  88%  84%  89%     14%        9%     17%   5%    229%( 15%)    124%    167%  10% 366%   9892   
89%  80%  84%  83%  93%  90%  91%  91%  91%     17%       11%     12%   6%    190%( 12%)    200%    145%   8% 428%   9796   
74%  61%  59%  60%  82%  76%  79%  80%  78%     20%       13%     14%   5%    212%( 14%)    208%    148%   7% 456%   8805   
76%  67%  60%  59%  82%  80%  81%  78%  79%     17%       12%     15%   6%    231%( 15%)    174%    157%   6% 388%   9663
 
  • TOP-BS output from full ASUP  
  PID USERNAME       THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
   10 root             8 155 ki31     0K   160K RUN     7    ??? 446.83% idle
 2684 root            44  40    0 99244K 13200K uwait   2 3286.6 100.00% fpolicy
    0 root           184 -88    -     0K  3944K gemini  5 9741.1  27.88% kernel
 3364 root             1   8    -     0K    68K CPU2    2 3039.9  16.36% disk_server_0
 4493 root             1  12    -     0K   192K WAIT    4 2814.8  12.99% wafl_exempt05
 4488 root             1  12    -     0K   192K WAIT    7 2814.0  12.74% wafl_exempt00
 4489 root             1  12    -     0K   192K WAIT    4 2814.9  12.65% wafl_exempt01
 4492 root             1  12    -     0K   192K WAIT    7 2812.9  12.55% wafl_exempt04
 4491 root             1  12    -     0K   192K WAIT    7 2811.9  12.35% wafl_exempt03
 4494 root             1  12    -     0K   192K WAIT    7 2814.4  11.96% wafl_exempt06
 4490 root             1  12    -     0K   192K WAIT    4 2811.9  11.57% wafl_exempt02

 

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