X-Spam-Check-By: sourceware.org To: cygwin AT cygwin DOT com From: "Cary Jamison" Subject: Re: sshd and scp/sftp: slow throughput on windows machines Date: Mon, 20 Mar 2006 13:04:40 -0700 Lines: 30 Message-ID: References: <003501c64a2e$3dede630$f4598350 AT HAUPTPC> X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com 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 -- 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/