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

Cyberduck trac at trac.cyberduck.ch
Mon Nov 15 10:48:31 CET 2010

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

Comment (by caeies):

 Replying to [comment:64 dkocher]:
 > Replying to [comment:56 caeies]:
 > > Back again,
 > >
 > > For your information the bandwidth (according to download via sftp) is
 around 11MB/s on my LAN. So there's still a x2 factor missing somewhere.
 > You could try what impact the cipher has on the transfer speed. We are
 usually negogiating `aes256-ctr` wheras OpenSSH prefers`aes128-ctr`. You
 could put the weaker cipher on top in `BlockCipherFactory.java` for

 So more info on this :

 I try sftp with the -o Ciphers=aes256-ctr option. The download speed is
 around the same than previously. But the window size looks like the same
 as the one used by cyberduck (which looks great :). So the download speed
 issue is still there. I will try to switch to weaker cipher as suggested
 in cyberduck, but not sure it's the issue.



Ticket URL: <http://trac.cyberduck.ch/ticket/185#comment:72>
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