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From "Mico Micic (JIRA)" <>
Subject [jira] [Commented] (NET-493) FTPClient: Slow data transfer rate if __bufferSize != 0
Date Sun, 23 Dec 2012 13:08:12 GMT


Mico Micic commented on NET-493:

I'm not sure with which version of Java I have tested it because I switched to 7 and back
to 6... Currently I am out of the office and will be back on Monday, 7th of January 2013.
I'll report back...
> FTPClient: Slow data transfer rate if __bufferSize != 0
> -------------------------------------------------------
>                 Key: NET-493
>                 URL:
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 3.2
>         Environment: Windows 7 32bit / Windows XP 32bit
>            Reporter: Mico Micic
>              Labels: ftpclient
>         Attachments: screenshot-1.jpg, screenshot-2.jpg
> 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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