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Date: | Sat, 18 Mar 2006 22:03:42 +0100 |
To: | "Max Stein" <Grizzly99 AT gmx DOT de>, <cygwin AT cygwin DOT com> |
From: | Arend-Jan Westhoff <jpmcyafvmhsl AT spammotel DOT com> |
Subject: | Re: sshd and scp/sftp: slow throughput on windows machines |
In-Reply-To: | <003501c64a2e$3dede630$f4598350@HAUPTPC> |
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At 02:49 2006-03-18 +0100, 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. > 1. Is it possible to increase the bandwith by having the client aggregate multiple sessions through a single pipe? 2. It would seem that PPTP connections can be much faster. E.g. a FreeBSD MPD running on a 400 Mhz Pentium II can sustain a 50 Mbit/s datastream at a CPU usage of 25%. W2k and XP have easy to configure PPTP clients. (See also W2003 RAS.) HTH, Arend-Jan Westhoff. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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