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Re: Performance issue in SFTP , CygWin Server
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Wed, 5 Oct 2011 18:20:43 +0200
- Subject: Re: Performance issue in SFTP , CygWin Server
- References: <email@example.com>
- Reply-to: cygwin at cygwin dot com
On Oct 5 06:41, BhavyaMadiri wrote:
> Our application downloads files from various source systems to our server. We
> have Red Hat Enterprise Linux (RHEL) 5.5 with Advanced Platform version on
> our server. Windows sources system (SRC1) , has Windows Server 2003 on their
> server that hosts Cygwin. They recently moved from FTP to SFTP. They are
> using Cygwin to support SFTP on Windows. The Cygwin setup version is 2.738.
> During sFTP load testing with SRC1, we encountered significant performance
> issue. Transferring 120K files of total size 58GB takes 4.5 hours using FTP
> but it takes 28 hours using SFTP.
I'd always expect some performance hit when using sftp compared to ftp,
in the order of 8 to 12 hours in your scenario, but 28 hours sounds a lot
compared to 4.5 hours.
What network connection do you have from your client to SRC1? Gigabit
Are the 58 Gigs files located on a local disk, or are they on a remote
fileserver? If remote, what server and what underlying protocol, SMB or
> We have not encountered any performance problems with downloading files
> (same number and size ) from unix/linux systems using SFTP.
> We suspect this performance issue to be related to Cygwin.
Unfortunately we don't know your Cygwin you're using on SRC1. Please
send a cygcheck -svr output as per http://cygwin.com/problems.html
Did you try a recent Cygwin snapshot from http://cygwin.com/snapshots/ ?
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Problem reports: http://cygwin.com/problems.html
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