What is the net.ipv4.tcp_notsent_lowat kernel tunable?

Solution Verified - Updated -

Issue

  • What is the net.ipv4.tcp_notsent_lowat kernel tunable / sysctl?
  • What ranges can I set it to?
  • How to use TCP_NOTSENT_LOWAT socket option?

Environment

  • Red Hat Enterprise Linux 8
  • TCP

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