[lwip-devel] [bug #64638] "iperf -r" does not work for all "-M"

[Hardy Griech]

URL:
  <https://savannah.nongnu.org/bugs/?64638>

                 Summary: "iperf -r" does not work for all "-M"
                   Group: lwIP - A Lightweight TCP/IP stack
               Submitter: rgrr
               Submitted: Fri 08 Sep 2023 06:25:38 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head


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Follow-up Comments:


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Date: Fri 08 Sep 2023 06:25:38 PM UTC By: Hardy Griech <rgrr>
This is true at least for the combination lwIP/TinyUSB.

On my Linux host, "iperf -r" did not work for small values of "-M <mss>". 
Reason was that the loop in lwiperf_tcp_client_send_more() is to restrictive. 
It aborts when "txlen >= (TCP_MSS / 2)".

For my setup it is needed, that this has to be changed to "txlen != 0",
because otherwise there is under described circumstances no transmission and
thus no lwiperf_tcp_client_sent() which retriggers send_more.

Should I provide the patch?







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