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  1. Qt
  2. QTBUG-113783

QTCPSocket continue write if receiver buffer is full

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Details

    • Bug
    • Resolution: Unresolved
    • P3: Somewhat important
    • None
    • 6.3.2, 6.5.0
    • Network: Sockets
    • None
    • Windows 11 Pro
      21H2
      Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz 3.60 GHz
      32.0 GB (31.9 GB usable)

      macOS BigSur
    • macOS, Windows

    Description

      Receive buffer size on server side is 65536, server isn't reading from buffer, but client continue write to buffer, message size is 8192 written about 8MB

      Used localhost for test

      Seems like tcp window scale option can help with it

      https://en.wikipedia.org/wiki/TCP_window_scale_option

      https://www.google.com/search?q=tcp+window+scale+option&rlz=1C1GCEU_ruBY931BY931&oq=wtcp+window+scale+option&aqs=chrome.1.69i57j0i13i512j0i13i30j0i13i15i30j0i5i13i30j0i8i13i30j0i8i13i15i30j0i13i30j0i8i13i15i30j0i390i650.8727j0j7&sourceid=chrome&ie=UTF-8

      Filter for Wireshark dump:
      tcp.port==55666

      Attachments

        1. client_logs.txt
          13 kB
        2. main_client.cpp
          1 kB
        3. main_server.cpp
          1 kB
        4. server_logs.txt
          0.2 kB
        5. wireshark_dump.pcapng
          3.52 MB
        6. wireshark_text_dump.txt
          57 kB
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          People

            manordheim Mårten Nordheim
            evgenpervenenko Evgen Pervenenko
            Vladimir Minenko Vladimir Minenko
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            Dates

              Created:
              Updated:

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