Subject: [libssh2] Speeding up file transfers

[libssh2] Speeding up file transfers

From: Dan Fandrich <>
Date: Wed, 8 Aug 2007 16:00:21 -0700

I ran into the following paper regarding speeding up ssh file transfers:

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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Received on 2007-08-09