[jira] [Resolved] (NET-493) FTPClient: Slow data transfer rate if __bufferSize != 0

["Sebb (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NET-493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebb resolved NET-493.
----------------------

    Resolution: Duplicate

NET-465 has been re-opened to deal with this.
                
> FTPClient: Slow data transfer rate if __bufferSize != 0
> -------------------------------------------------------
>
>                 Key: NET-493
>                 URL: https://issues.apache.org/jira/browse/NET-493
>             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|https://issues.apache.org/jira/browse/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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