Mico Micic created NET-493:
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Summary: 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
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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