Supported page sizes by processor type

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Use the pagesize command with the -a option to determine all of the page sizes supported by AIX® on a particular system.

AIX 6.1 and later supports segments with two page sizes: 4 KB and 64 KB. By default, processes use these variable page size segments. This is overridden by the existing page size selection mechanism.

Table 1. Page size support by AIX and different System p hardware
Page Size	Required Hardware	Requires User Configuration	Restricted
4 KB	ALL	No	No
64 KB	POWER5+ or later	No	No
16 MB	POWER4 or later	Yes	Yes
16 GB	POWER5+ or later	Yes	Yes

Table 2. Supported segment page sizes
Segment Base Page Size	Supported Page Sizes	Minimum Required Hardware
4 KB	4 KB/64 KB	POWER6®
64 KB	64 KB	POWER5+
16 MB	16 MB	POWER4
16 GB	16 GB	POWER5+

As with all previous versions of AIX, 4 KB is the default page size. A process will continue to use 4 KB pages unless a user specifically requests another page size be used.