[vasketsov]

Вот, из ResKit-а.

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

Data type Range Default value
REG_DWORD  0x0 | 0x1 - 0xFFFFFFFF bytes  0  

Description
Specifies the maximum number of bytes that can be locked for I/O operations.

Value Meaning
0x0 The system sets the lock limit to 512 KB.
0x1 - 0xFFFFFFFF bytes The value entered overrides the system default and is used as the I/O lock limit.
 
Note

The maximum lock limit is determined by the amount of physical memory on the computer. Do not set the lock limit above the following values:

Amount of physical memory Maximum lock limit
Less than 64 MB Physical memory minus 7 MB
64 MB - 500 MB Physical memory minus 16 MB
512 MB and greater Physical memory minus 64 MB