[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
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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 |
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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
testing.
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.
regards,
Caeies
--
Ticket URL: <http://trac.cyberduck.ch/ticket/185#comment:72>
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