tcp_cubic: better follow cubic curve after idle period

Solution Unverified - Updated -

Issue

  • Cubic congestion control bug in Linux kernel TCP.
  • What's the status re: relevance for this to different RHEL versions as well as status re: fixes for this across different RHEL versions?
  • TCP connections transfer unacceptably slow after long application idle period
  • TCP window shrinks to 64 bytes, cwnd stays very small and never grows

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • CUBIC TCP congestion control algorithm (default)

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