(Sharing this based on a conversation with Kohsuke at JUC this morning)

Greetings!  If you use Jenkins to generate/archive/copy large artifacts 
like ISOs, OVAs, Vagrant Boxes, etc then you may find this useful.

Leveraging the learning 
from http://www.damtp.cam.ac.uk/user/ejb48/sshspeedtests.html I created a 
custom SSH slave launcher which gives my organization 10x faster network IO 
performance when archiving & copying large artifacts.

Here's the gist: https://gist.github.com/tehranian/7123269

You may have to modify the details to fit your environment, but the 
principle is there.

Kohsuke - Maybe we can incorporate the learnings from the SSH Cipher/MAC 
benchmarks into Jenkins' SSH Slave plugin.  I see that "trilead-ssh" has 
implementations of several ciphers:
  
https://github.com/jenkinsci/trilead-ssh2/tree/master/src/com/trilead/ssh2/crypto/cipher

Dan

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