HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

Data type


Default value


0x0 | 0x1–0x20000000 bytes | 0xFFFFFFFF



Specifies the size of the paged pool .




The system calculates an optimal value for this entry based on the amount of physical memory in the computer, and it adjusts this value if the amount of memory changes. The system algorithm typically sets the size of the paged pool to approximately twice that of the nonpaged pool size. This value is optimal for most systems.

0x1–0x20000000 bytes

Creates a paged pool of the specified size. This takes precedence over the value that the system calculates, and it prevents the system from adjusting this value dynamically. Limiting the size of the paged pool to 192 MB (or smaller) lets the system expand the file system (or system pages) virtual address space up to 960 MB. This setting is intended for file servers and other systems that require an expanded file system address space (meaning slightly faster access) at the expense of being able to actually cache less data. This only makes sense if you know the files your server frequently accesses already fit easily into the cache.


The system calculates the maximum paged pool allowed for the system in this configuration. For 32-bit systems, this is typically less than 500 MB. This setting is typically used for servers that are attempting to cache a very large number of frequently used small files, some number of very large size files, or both. In these cases, the file cache that relies on paged pool to manage its caching is able to cache more files (and for longer periods of time) if more paged pool is available.

Activation method

You must restart the computer before a change to this value takes effect.


If the paged pool on a system is 192 MB or smaller (including 0, which means auto-size), the system can expand the file system virtual address space or the system pages virtual address space up to 960 MB. For more information, see the SystemPages entry.


For more information on paged pools and nonpaged pools, see the Microsoft Knowledge Base link on the Web Resources page. Search the Knowledge Base for Article Q126402, or use the keywords PagedPoolSize and NonPagedPoolSize.

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