Error msg - Failure to calculate super-latch promotion threshold - also known as Sub Latch. - Supporting article posted back in 09

http://blogs.msdn.com/b/psssql/archive/2010/03/24/how-it-works-bob-dorr-s-sql-server-i-o-presentation.aspx

Sub-latch is also referred to as super latch. These are only used for data cache page latches. They are designed to reduce the latching contention on hot pages. For example if you have a lookup table that is only a few pages in size but used by 100s of queries per second that SH latch activity is aggressive to protect the page. When SQL Server detects high rates of SH latch activity for a sustained period a buffer latch is PROMOTED to a sub-latch. A sub-latch partitions a single latch into an array of latch structures per logical CPU. In doing so the worker (always assigned to a specific CPU) only needs to acquire a SH on the sub-latch assigned to the local scheduler. This avoids interlocked activity and cache line invalidations across all physical CPUs. The acquiring of an SH sub-latch resource uses less resources and scales access to hot pages better.