[lwip-devel] [task #14506] TCP: Combine RTO and Zero-window Probe mechanisms

[Joel Cunningham]

URL:
  <http://savannah.nongnu.org/task/?14506>

                 Summary: TCP: Combine RTO and Zero-window Probe mechanisms
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: jcunningham
            Submitted on: Tue 09 May 2017 02:16:11 PM UTC
                Category: TCP
         Should Start On: Tue 09 May 2017 12:00:00 AM UTC
   Should be Finished on: Tue 09 May 2017 12:00:00 AM UTC
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
                  Effort: 0.00

    _______________________________________________________

Details:

See RFC 1122, 4.2.2.17  Probing Zero Windows.  The RFC suggests that
retransmission timer and zero-window probing may be able to be a shared
mechanism since they both use exponential backoff and have a fixed maximum
timeout

We can combine the two mechanisms to reduce TCP variables in the pcb and also
hopefully reduce code size

We should also audit our timeouts to make sure they follow guidance in RFC
1122 section 4.3.2.5 TCP Connection Failures.  Be sure to check for any newer
RFC on this topic and possibly study other stacks maximum timeouts
(Linux/FreeBSD/NetBSD)






    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/task/?14506>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.nongnu.org/