We just upgraded one of our server to a 32 core, 256 GB RAM Itanium based server (HP rx8640), and now we are seeing a LOT of LATCH_EX waits.
Breaking down the latch stats (from sys.dm_os_latch_stats) we can see that we are waiting heavily on NESTING_TRANSACTION_FULL latches.
This class accounts for approx. 89% of the total latch waits!
We cannot, however, find any documentation on this - apart from the fact that it is "internal use only".
Can you help?