Guide to Multiple Page Size Support on AIX 5L Version 5.3

The POWER5+™ processor and AIX 5L™ Version 5.3 with the 5300-04 Recommended Maintenance Package introduce support for two new virtual memory page sizes – 64KB and 16GB. Using larger virtual memory page sizes for an application’s memory can significantly improve an application's performance and throughput due to hardware efficiencies associated with larger page sizes. While 16GB pages are intended to only be used in very high-performance environments, 64KB pages are general-purpose, and most workloads will likely see a benefit by using 64KB pages rather than 4KB pages. This document gives an overview of the new multiple page size support of AIX 5L and how a user can use these new page sizes for an application’s memory to potentially improve performance.

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