6.6.1 Large page support in AIX

System p5 processors support 4 KB and 16 MB page sizes. The introduction of System p5+ and later processors has added two new page sizes: 64 KB and 16 GB.

AIX Versions 5.2 and later support the 16 MB page sizes. AIX 5.3 ML 5300-04 and later support all four page sizes: 4 KB, 16 MB, 64 KB, and 16 GB. Table 6-6 shows the support matrix for medium and large page sizes.

The default page size is always 4 KB, which processes will use unless specified otherwise. 16 MB and 16 GB page sizes are restricted and thus require system configuration changes.

Table 6-6

Machine type	Available page sizes	AIX support
POWER4 or later	4 KB, 16 MB	64-bit and 32-bit AIX 5.2 and later
POWER5+ or later	4 KB, 64 KB, 16 MB, 16 MB	64-bit AIX 5.3 ML 5300-04 and later

Large page size support matrix

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