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  1. Commons Net
  2. NET-493

FTPClient: Slow data transfer rate if __bufferSize != 0

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 3.2
    • Fix Version/s: None
    • Component/s: FTP
    • Labels:
    • Environment:

      Windows 7 32bit / Windows XP 32bit

      Description

      The patch applied in NET-465 causes a very slow data transfer rate. The line

      850: socket.setSendBufferSize(__bufferSize)

      in

      _openDataConnection_

      sets the buffer size to 1024 by default. With this size I had a very bad transfer rate on windows 7 and XP. The wireshark log shows that each FTP-DATA packet is exactly 1024 bytes long and has to be acknowledged on the TCP layer before the next one is sent. I don't know why, but when I set the buffer size to 0 (FTPClient.setBufferSize) the transfer rate is fine.

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        1. screenshot-2.jpg
          260 kB
          Mico Micic
        2. screenshot-1.jpg
          260 kB
          Mico Micic

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              • Assignee:
                Unassigned
                Reporter:
                mic_mim Mico Micic
              • Votes:
                4 Vote for this issue
                Watchers:
                7 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: