Large page optimization

Large page optimization is a feature of IBM® AIX Dynamic System Optimizer that automatically changes the page size to a larger 16 MB page size when it predicts improved performance.

Large page optimization transparently upgrades 4 KB and 64 KB page sizes of System V shared memory and 64 KB page size of process text to 16 MB page size. This larger page size can benefit workloads that use large chunks of data because it reduces the number of errors caused by the translation lookaside buffer (TLB). When this optimization is installed, is activated, and determines that there might be a benefit, ASO automatically promotes heavily used regions of memory to 16 MB pages. This optimization potentially improves the performance of workloads that use those regions because it reduces the number of TLB misses.
Note: Only System V shared memory and process text is eligible for large page optimization.