What is socket busy polling and how is it used?

Solution Verified - Updated -


  • What is socket busy polling and how is it used?
  • Compared to RHEL 7, the RHEL8 guide describes "Busy polling behavior is supported by all the device drivers".
  • Is it right? If then, can we apply it on a virtual environment?
  • What is busy polling logic and how can we calculate how much CPU utilization will be increased?
  • What CPU will be used for busy polling?


  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Low latency busy polling sockets using:
    • busy_poll and busy_read kernel tunables
    • SO_BUSY_POLL socket option

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