From: Allan Schrum <aschrum@ecdeliverysystems.com>
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Date: Wed, 11 Mar 2009 10:53:12 -0400
Subject: RE: Connecting to cygwin ssh is slow
Message-ID: <9BE596E8BDDC3443BF23B9678D03CC2930B320B4@ECDS-CLT-MX1.ecdeliverysystems.com>
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> -----Original Message-----
> From: cygwin-owner@cygwin.com [mailto:cygwin-owner@cygwin.com] On
> Behalf Of Dave Steenburgh
> Sent: Wednesday, March 11, 2009 10:45 AM
> To: cygwin@cygwin.com
> Subject: Re: Connecting to cygwin ssh is slow
>=20
> On Wed, Mar 11, 2009 at 10:05 AM, UdiK <udik@commtouch.com> wrote:
> > When I connect to our cygwin SSH machine (Windows 2003 server), it
> usually
> > takes more than 5 seconds to get a prompt and be able to start
> working. This
> > delay slows down many of our scripts which rely on SSH to connect to
> > Windows.
> >
> > What causes this delay? What is SSH doing that is taking it so long?
> I don't
> > have any anti-virus running on that machine. If anybody has any
> explanations
> > I really appreciate the help.
>=20
> Connect, then immediately logoff and connect again.  Does the second
> connect have the same pause?  If not, then I suspect the delay is your
> hard drive.  If you connect infrequently, then when you do connect,
> it's likely that the necessary processes (or parts of them) will have
> to be retrieved from the page file, and any configuration files will
> probably have to be loaded from the hard drive.  If you connect
> frequently, I think there's a way to make the ssh connection
> persistent---you might avoid the delay that way, or lessen it.  I
> don't know how to set that up, though.
>=20
> I also experience a delay when I make the first connection, but
> subsequent connections are pretty snappy.  Most of the time I don't
> need subsequent connections, but I do have a script that makes two
> connections.  If this isn't the answer, then I'd like to know what is,
> so I can improve that first connection time.

Don't forget DNS lookup time.


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