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From:	"Max Stein" <Grizzly99 AT gmx DOT de>
To:	<cygwin AT cygwin DOT com>
References:	<20060318210347 DOT 8FB7A2680 AT dot DOT warande DOT net>
Subject:	Re: sshd and scp/sftp: slow throughput on windows machines
Date:	Sat, 18 Mar 2006 22:52:00 +0100
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> 1. Is it possible to increase the bandwith by having the client aggregate
> multiple sessions through a single pipe?

Could you please give me some advice how this can be achieved? I am not an 
SSH guru yet.

> 2. It would seem that PPTP connections can be much faster. E.g. a FreeBSD
> MPD running on a 400 Mhz Pentium II can sustain a 50 Mbit/s datastream at 
> a
> CPU usage of 25%.
> W2k and XP have easy to configure PPTP clients.
> (See also W2003 RAS.)

Why should a point to point tunnel improve the performance? Using Linux on 
the client and server machines I achieved a throughput of 10.8 MB/s whereas 
the theoretical maximum on a 100 MBit/s ethernet network would be 12.5 MB/s.

There must be another way. Why is the Linux implementation of SSH able to 
provide a much better throughput for scp/sftp
than cygwin's implementation running on the same hardware? It is not a 
problem of the Windows operating system because usual FTP tranfer yields 
simalar fast throughput of 10-11 MB/s like SSH running on Linux.


Max Stein 


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