Registry Guide for Windows

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Registry tweaks, tricks & hacks to optimize, enhance and secure Microsoft Windows.

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Home > Windows > File System > Caching and Memory

(Windows NT/2000) Popular
Windows will normally limit the amount of RAM that can be locked for file system operations. This setting allows you to modify the automatic value.

This tweak can be easily applied using WinGuides Tweak Manager.
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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

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.


(Default)	REG_SZ	(value not set)
IoPageLockLimit	REG_DWORD	0x00000000 (0)


	HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session ...

Registry Settings

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

Related Tweaks

Optimize the System Cache Size (Windows NT/2000/XP)
Improve Core System Performance (Windows NT/2000/XP)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.

Last Modified: October 17, 2002