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CONTAP-242986: Timeouts and latency on nfs lookups with FPOLICY

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ontap-9
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Issue

  • After upgrading ONTAP from version 9.9.1P16 to 9.13.1P8, Intermittent performance issue that causes commands like
ls to timeout can be seen. 

  • Observing latency on nfs lookups:
================================================
RPC SRT Statistics:
Filter: nfs.procedure_v3

Index  Procedure              Calls    Min SRT    Max SRT    Avg SRT    Sum SRT
    1  GETATTR                    23   0.000387   0.000519   0.000445   0.010242
    3  LOOKUP                   6856   0.001472  34.995091   0.007256  49.745074
    4  ACCESS                     19   0.000388   0.000587   0.000459   0.008728
   16  READDIR                   137   0.000555   0.002521   0.001063   0.145611
   17  READDIRPLUS                40   0.000428   0.009099   0.001039   0.041568
   18  FSSTAT                      1   0.000588   0.000588   0.000588   0.000588

================================================

  • NFS operations give up and return jukebox error to the client, this can be observed in packet traces :
    • [NFS 22 V3 LOOKUP Reply (Call In 141723) Error: NFS3ERR_JUKEBOX]
  • and in SKTRACE :
    • [[0:0] NBLADE_Chk:  n0x7b9510: src/Protocols/Nfs/NfsFPolicyProcess.cpp:1636 rt=3288]
    • [[0:0] NBLADE_Chk:  n0x62a615: src/Protocols/Nfs/Nfs3/Nfs3ProcRename.cpp:249 rt=3288]
    • [[14:0] NBLADE_Chk:  n0x7b9510: src/Protocols/Nfs/NfsFPolicyProcess.cpp:1636 rt=3288]
    • [[14:0] NBLADE_Chk:  n0x617331: src/Protocols/Nfs/Nfs3/ Nfs3ProcLookup.cpp:274 rt=3288]
  • Disabling FPOLICY stops the issue

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