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Re: speed limitation with scp and sftp using openssh

from [cremes . devlist] Network Security [Permanent Link]
Subject: Re: speed limitation with scp and sftp using openssh
Date: Fri, 24 Feb 2006 11:31:59 -0600 

On Feb 23, 2006, at 8:02 PM, Richard Labutis wrote:

I am running aix 4.3, 5.1, 5.2, 5.3 using various
versions of openssh.

why is there a speed limit in copying files from one
machine to another. The speed appears to cap out at
around 7-8 mb/sec. This is on a gigabit network.
I know encryption has overhead, but not that much.
scp and sftp  is the commands used to copy files.
It makes no difference what version of ssh/aix, it all
has the same results.

if I used rcp or ftp, it's very fast.

Take a look at this [1] for an explanation. Last I heard these patches were not accepted into the trunk because they didn't conform to some style guidelines. Corrections welcome...

cr

[1] http://www.psc.edu/networking/projects/hpn-ssh/

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