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Alberto, attached to the post is a document that should help you. The Cluster on Die information starts on page 24.
There are some recommended configurations for the various snoop modes. These can be found on pages 80, 112 and 113.
I really think the rest of the information in the document will be helpful for you as well.
Regarding your specific questions:
Question #1. Yes, CoD is only available on processors with 10 or more cores.
Question #2. Yes, LLC misses are handled by the HA (Home Agent, not SA or System Agent) on the cluster that generated the miss.
Question #3. Yes, data is placed on the LLC slices on the ring requiring the core fetching them.
I also found this article from Dell. It is also very informative: http://en.community.dell.com/techcenter/high-performance-computing/b/general_hpc/archive/2014/09/23/bios-tuning-for-hpc-on-13th-generation-haswell-servers
I know this is an old thread, but hoping to get lucky.
The attached .PDF is fantastic. Where can I find copies for v4 and other processor families. Plus it is hard to cite a .pdf attached to a thread when discussing information from this document. Again one of the better documents on many facets of how the new processors work and benchmarks I have seen and I wish I knew this existed 2 years ago when you posted it.