sshd and scp/sftp: slow throughput on windows machines
Max Stein
Grizzly99@gmx.de
Sat Mar 18 22:10:00 GMT 2006
> 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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