Recently I have been looking in to DP load testing, I found this excellent article on a technet blog
At Microsoft, we have 280,000+ client machines that are managed worldwide and in our past life we were planning to scale our service to other companies client machines as well. As part of the platform team responsible for ensuring that our ConfigMgr 2007 infrastructure could scale to support hundreds of thousands of clients (and even millions), we had to find a way to solve a rather non-trivial mechanism for testing our Distribution Points (DP) to ensure they could effectively manage the connections thrown at them by the CCMEXEC (SMS) client agent.
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Awesome first article on a subject that a lot of folk would be interested in :>