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Date: Wed, 11 Mar 2009 11:05:50 -0400
Message-ID: <5a05e0e60903110805j347f9239p77e3c428d39b1f89@mail.gmail.com>
Subject: Re: Connecting to cygwin ssh is slow
From: Dave Steenburgh <dave DOT steenburgh AT gmail DOT com>
To: cygwin AT cygwin DOT com
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On Wed, Mar 11, 2009 at 10:53 AM, Allan Schrum
<aschrum AT ecdeliverysystems DOT com> wrote:
>> -----Original Message-----
>> From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On
>> Behalf Of Dave Steenburgh
>> Sent: Wednesday, March 11, 2009 10:45 AM
>> To: cygwin AT cygwin DOT com
>> Subject: Re: Connecting to cygwin ssh is slow
>>
>> On Wed, Mar 11, 2009 at 10:05 AM, UdiK <udik AT commtouch DOT 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.
>>
>> Connect, then immediately logoff and connect again. =A0Does the second
>> connect have the same pause? =A0If not, then I suspect the delay is your
>> hard drive. =A0If 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. =A0If 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. =A0I
>> don't know how to set that up, though.
>>
>> I also experience a delay when I make the first connection, but
>> subsequent connections are pretty snappy. =A0Most of the time I don't
>> need subsequent connections, but I do have a script that makes two
>> connections. =A0If 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.

Good point.  Taking that out of the equation, there's still a
noticeable delay when I connect across my home LAN using the IP
address.

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