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From:	"Cary Jamison" <Cary_Jamison AT Symantec DOT com>
Subject:	Re: sshd and scp/sftp: slow throughput on windows machines
Date:	Mon, 20 Mar 2006 13:04:40 -0700
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Max Stein wrote:
> Unfortunately, the performance of the cygwin sshd server is very poor
> when it comes to copying large files. I have made this observation on
> several new and fast machines (3 GHz, 512 MB RAM, 100 MB/s Intel Pro
> network card) running with Windows XP or Windows 2003 Server. The
> best speed achievable was about 4 MB/s when copying a file from the
> SSH client to the SSH server; when doing it the other way round, the
> throughput was even worse, about 2.3 MB/s. I tried it on three
> different machines running the newest version of cygwin's sshd und
> scp/sftp. The results were approximately the same. Neither the
> client's nor the server's processor was really busy. The CPU usage
> oscillated around 30-40%.
> Setting up the same scenario on linux yielded a completely different
> picture. Using the Knoppix disc 4.0.2 on the client and the server
> machine I easily achieved a throughput of 10.8 MB/ in both directions
> (pushing a file to the server or downloading a file from it).
>
> What could be done to improve the performance of cygwin's SSH server?
> There were already some older posts dealing with the same problem but
> nobody had really a constructive idea or proposal.

This was discussed on cygwin-xfree a few months ago - Holger Krull posted a 
message with a link to a patch to improve things :

http://sourceware.org/ml/cygwin/2005-11/msg00897.html


Cary




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