Large-Scale Tuning for Cray XT

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This section applies to Cray XT3 Catamount nodes and explains parameters used with the kptllnd module.

Network Tunables
With a large number of clients and servers possible on these systems, tuning various request pools becomes important, requiring changes to the ptllnd module.

These two tunables combine to set the size of the ptllnd request buffer pool. The buffer pool must never drop an incoming message, so proper sizing is very important.