High Performance SSH/SCP - HPN-SSH when?

Chris Rapier rapier at psc.edu
Sun Mar 26 15:37:57 EST 2006

Well, I'm the developer of this patch and I fully respect their decision 
not to incorporate at this time.

The OpenSSH dev group has, I believe, different priorities. Security is, 
and must be, foremost in their mind. Performance rightly takes a back 
seat to security concerns. On the other hand, as a developer for high 
performance networks I have a client base that needs the performance so 
that is foremost in my mind. I don't believe my patch compromises 
security but the development group has to be sure of this. Their 
reputation will be far more affected than mine if there turns out to be 
a problem.

Eventually, I believe that some version of the buffer tuning concept 
will be incorporated but it has to meet the high quality requirements of 
the development group. In the mean time, early adopters and other people 
willing to incorporate this patch are perfectly free to do so. In fact, 
even when communicating with non-HPN hosts a performance boost will be 
seen if the bulk data flow is in the direction of the HPN patch host. So 
even without incorporation of the patch into the main source tree people 
  can see these advantages.

Development is on going and new version of the patch will be available 
shortly. This new version of the patch will hopefully address a 
performance issue in LAN transfers.

Chris Rapier

fast wrote:
> Hi,   
> http://www.psc.edu/networking/projects/hpn-ssh/   
> Clearly, the HPN patches significantly boost throughput performance.   
> This enhancement is entirely from tuning the SSH buffer sizes.  
> Alex Tavcar  
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