What does "delayed acks sent" in netstat mean?

Solution Verified - Updated -

Issue

  • What does "delayed acks sent" in netstat mean?
  • In the output of netstat -s we see:

    145992857 delayed acks sent
    112986 delayed acks further delayed because of locked socket
    

    what does this mean?

Environment

  • Red Hat Enterprise Linux
  • TCP

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