[Cyberduck-trac] [Cyberduck] #185: Slow SFTP transfers

Cyberduck trac at trac.cyberduck.ch
Tue Nov 9 16:17:35 CET 2010

#185: Slow SFTP transfers
    Reporter:  wout.mertens@…          |        Owner:  dkocher      
        Type:  enhancement             |       Status:  reopened     
    Priority:  high                    |    Milestone:  4.0          
   Component:  sftp                    |      Version:  3.5          
    Severity:  major                   |   Resolution:               
    Keywords:                          |     Platform:  Mac OS X 10.6
Architecture:  Intel                   |  

Comment (by caeies):

 I svn co the code and "played" a little bit with the code and the buffers.
 I reach ~200KB/s by changing :
    * the max_parallelism from 10 to 8 (SFTPv3Client.java)
    * the buffer request from 2000 -> 4096  ("")
    * the default connection.chunksize * by 16 ... (Preference.java)

 A little bit of reading about the SFTP Protocol let me think that bigger
 are the buffers, Quicker are the downloads ...

 I will try to investigate a little bit more in what you call the
 parallelism read ...



Ticket URL: <http://trac.cyberduck.ch/ticket/185#comment:50>
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