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Why is there lower throughput with increased nconnect threads with IPsec enabled

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • IPsec
  • nconnect

Answer

  • Testing shows that higher nconnect threads with IPsec equates to lower throughput.
  • IPsec requires additional CPU resouces to decrypt incoming traffic, reducing resources available for network processing leading to lower throughput.
  • With higher nconnect threads, the concurrency lowers due to the additional decrypting resources needed.
  • Lowering the nconnect threads adds resources available to process network traffic, increasing throughput.
  • Smaller OP sizes see the greatest degradation in throughput.

Example:

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Additional Information

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