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From "Mico Micic (JIRA)" <>
Subject [jira] [Created] (NET-493) FTPClient: Slow data transfer rate if __bufferSize != 0
Date Wed, 12 Dec 2012 13:21:21 GMT
Mico Micic created NET-493:

             Summary: FTPClient: Slow data transfer rate if __bufferSize != 0
                 Key: NET-493
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 3.2
         Environment: Windows 7 32bit / Windows XP 32bit
            Reporter: Mico Micic

The patch applied in [NET-465|] causes a very
slow data transfer rate. The line {code}850: socket.setSendBufferSize(__bufferSize){code}
in {code}_openDataConnection_{code} 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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