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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Thu, 1 May 2003 11:23:29 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	brian AT genisio DOT org
cc:	cygwin AT cygwin DOT com
Subject:	Re: SSH tunneling buffers...
In-Reply-To:	<20030501150539.74650.qmail@web20810.mail.yahoo.com>
Message-ID:	<Pine.GSO.4.44.0305011122070.25128-100000@slinky.cs.nyu.edu>
Importance:	Normal
MIME-Version:	1.0

On Thu, 1 May 2003, Brian Genisio wrote:

> Hi all...
>
> I am using SSH to tunnel (Using LocalForwarding ports) from one application to
> another.  The system exists of a controller software in Linux (where the SSH
> server resides), and the actual software in Cygwin.
>
> Cygwin connects to the Linux SSH server and sets up a port forward.  The Linux
> app sends a small amount of data (about 12 bytes) 30 times per second.
>
> The problem is that the Cygwin/SSH side of the tunnel is buffering the data
> before it sends it to the Cygwin app.  The result is the data is received in
> bursts, and the control is not fluid.
>
> I have tried this system in a Linux to Linux situation, and the buffering did
> not happen.  Also, I have tried sending data from Cygwin to Linux, and the
> buffering does not happen.  It only happens when data is being sent from Linux
> to Cygwin.
>
> I have also tried switching between LocalForward and RemoteForward, and it is
> the dirction that matters, not the type of port forwarding.
>
> Both sides sets the TCP_NODELAY flag before it starts sending, and I know the
> SSH code does the same...
>
> Any ideas?
> Brian

Brian,

Does "ssh -vvv" show anything that could be related to this?
	Igor
-- 
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     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski
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Knowledge is an unending adventure at the edge of uncertainty.
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