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

Cyberduck trac at trac.cyberduck.ch
Tue Nov 9 22:37:09 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:57 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.
 > Is that what you get with OpenSSH? One should compare the size of the
 local window getting adjusted during this transfer in comparison. Run
 `sftp -vvv`.

 Yeah, That's what I get with openSSH. sftp -vvv give me a window of 131072
 (comment:52) when yours is around ~92000 IIRC (I don't have any mac
 computer at home). That's only for download (I didn't try the upload with
 -vvv). And it was 16384 when I was playing around with the different
 chunksize / message length ... So it's clearly better, but "could he
 higher" :).
 And yes there's 64 or 65 requests at the same time (If you log at the logs
 R = 65 in my case).

Ticket URL: <http://trac.cyberduck.ch/ticket/185#comment:60>
Cyberduck <http://cyberduck.ch>
Open source FTP, SFTP, WebDAV, Cloud Files, Google Docs & Amazon S3 Browser for Mac & Windows.

More information about the Cyberduck-trac mailing list