I ran into the following paper regarding speeding up ssh file transfers:
http://www.psc.edu/networking/projects/hpn-ssh/old-site/

This topic came up not too long ago on this list.  The paper shows how
ssh transfers in the tested client over high-speed links were limited
by the TCP and SSH window sizes, and not by encryption speeds or
other factors.  The solution (which resulted in a more than 1000% speed
increase) was to dynamically change the ssh window size in lock step
with the underlying TCP window size.  That sounds like a good technique to
fix the libssh2 bottleneck as well.

>>> Dan
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