Calculating innodb_additional_mem_pool_size?

[Matt Solnit]

Is there a good way of calculating the size for
innodb_additional_mem_pool_size?  I would like to calculate based on the
number of tables, rows, or whatever else I can use to pre-determine a
value so that the warning message "allocating memory from the OS" does
not appear.

-- Matt Solnit
msolnit@stripped

P.S.  This is just here to satisfy the spam filter:  MySQL