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Tutorial 8.6.3. Drilling Down Into IBS Data In order to find the source of the performance issue in the example program, we need to drill down into the classic module. 1. Double-click on the module name classic in the System Data table. A list of functions within classic is displayed with the IBS information for each function. CodeAnalyst retains the "IBS MEM data TLB" view. The function "multiply_matrices" has the most load/store activity and incurs the bulk of the DTLB misses. 137