compression only in one direction

Olsen, Alan R alan.r.olsen at
Fri Mar 8 05:55:11 EST 2013

[Sorry for the top post. I hate Outlook.]

How much CPU does SSH take for compression? (I have never benchmarked it.) I have never noticed an issue with hit impacting a machine when compression is turned on. Seems like more pain that it is worth.

-----Original Message-----
From: at [ at] On Behalf Of Markus Falb
Sent: Thursday, March 07, 2013 10:29 AM
To: openssh-unix-dev at
Subject: compression only in one direction

I know that it is possible to enable or disable compression.
I just learned that the protocol would allow for one-way negotiations for things like how to encrypt the traffic, hash it, compress it.

Many people have very asymmetric internet access bandwidth.
e.g. 1 mb download, only 100 kb upload

Would it not be useful to be able to compress only outbound traffic in such a situation?
Kind Regards, Markus "just wondering"
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