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TCP reassembly queue overflows lead to poor performance and possible application disruption in versions of ONTAP 9.3, 9.4 and 9.5

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Applies to

  • ONTAP 9.5
  • ONTAP 9.4
  • ONTAP 9.3

Issue

  • A security vulnerability fix in the ONTAP networking stack causes Transmission Control Protocol (TCP) performance to unexpectedly degrade.
  • Signature:
  • TCP slowness
  • Network is not lossless 
  • Indications that the TCP reassembly is being overran can be seen via ‘netstat -s -p tcp’  
    • Command: node run -node <node> netstat -s -p tcp 
    • Counter: <no. packets> discarded due to memory problems 
The number of discarded packets may vary

 

 

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