Increase File System Caching Memory

Posted On 2007-06-20 by FortyPoundHead
Keywords: Increase File System Caching Memory
Tags:  Windows NT Windows 2000
Views: 1798

Windows NT will normally limit the amount of RAM that can be locked for I/O operations. Using this registry key will allow you to override the automatic setting.
Open your registry and find the key below.
Create a new DWORD value named 'IoPageLockLimit' if it does not already exist. Set the value to equal the maximum number of Kbytes to be allocated to I/O operations as per the table below:

RAM IoPageLockLimit
(MB) Decimal Hex
4 4096 1000
8 8192 2000
16 16384 4000
32 32768 8000
64 65536 10000

As with all performance related changes, get a baseline measurement using performance monitor and then make your changes in small increments and retest the performance after each change.

Key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]
Value Name: IoPageLockLimit
Data Type: REG_DWORD
Data: 0 = default

More Info:

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