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.
Max Stein
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