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[lwip-devel] [bug #42633] Write many frames at high speed to a PC stops


From: Bart Houkes
Subject: [lwip-devel] [bug #42633] Write many frames at high speed to a PC stops communication random.
Date: Fri, 27 Jun 2014 08:45:49 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0

URL:
  <http://savannah.nongnu.org/bugs/?42633>

                 Summary: Write many frames at high speed to a PC stops
communication random.
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: mensfort
            Submitted on: Fri 27 Jun 2014 08:45:48 AM GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.1

    _______________________________________________________

Details:

I have an embedded device with LWIP that sends 400KByte text to a PC at high
speed. 

During monitoring on Wireshark I see following:

Usually, every block of data is acknowledged immediately after sending the
data. After some time, LWIP sends 3 frames to a PC and receives an acknowledge
for the first frame. So, 2 frames are not acknowledged yet. Then LWIP sends
more frames until TCP_WND is reached. Then, the first outstanding frame that
needs an acknowledge is resent several times... the PC does not react anymore,
although I think it should send an ACK.

This issue happens when I call the TCP-layer directly, but also when I use
netconn to send data. 

I have tried this in Windows, Linux, Telnet and others... so it must be a
problem in LWIP. What can be wrong?



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Fri 27 Jun 2014 08:45:48 AM GMT  Name: evidence.png  Size: 144kB   By:
mensfort

<http://savannah.nongnu.org/bugs/download.php?file_id=31626>

    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/bugs/?42633>

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