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

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.2
• Component/s: FTP
• Labels: ftpclient

Environment

Windows 7 32bit / Windows XP 32bit

• Assignee: Unassigned
• Reporter: Mico Micic
• Created: 12/Dec/12 13:20
• Updated: 17/Apr/13 20:05
• Resolved: 24/Jan/13 00:36

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.

Issue Links

• duplicates: NET-465 FTPClient setSendBufferSize and setReceiveBufferSize on data socket
• is duplicated by: NET-499 FTP transfer to mainframe extremely slow