Q250453: Determining Special Pool Tagging Options When Debugging

Article: Q250453
Product(s): Microsoft Windows NT
Version(s): 4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Operating System(s): 
Keyword(s): kbenv kbtool
Last Modified: 10-JUL-2002

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The information in this article applies to:

- Microsoft Windows NT Server versions 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a 
- Microsoft Windows NT Workstation versions 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a 
- Microsoft Windows NT Server, Enterprise Edition versions 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a 
- Microsoft Windows NT Server versions 4.0 SP4, 4.0 SP5, Terminal Server Edition 
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IMPORTANT: This article contains information about modifying the registry. Before you 
modify the registry, make sure to back it up and make sure that you understand how to restore 
the registry if a problem occurs. For information about how to back up, restore, and edit the 
registry, click the following article number to view the article in the Microsoft Knowledge Base:

  Q256986 Description of the Microsoft Windows Registry

SUMMARY
=======

NOTE: This article assumes that you are familiar with the information in the
following Microsoft Knowledge Base article regarding the Windows NT Special Pool
feature:

  Q188831 How to Use the Special Pool Feature to Isolate Pool Damage

When you are using the Special Pool tagging features of Windows NT 4.0 Service
Pack 4 and later, you can verify the configuration of the registry options by
using a Memory.dmp file or a live debug.

You can check the various Special Pool options by using several of the global
variables available. The ability to verify the settings can be useful when you
are working with computers that require that Special Pool be used.

MORE INFORMATION
================

WARNING: If you use Registry Editor incorrectly, you may cause serious problems
that may require you to reinstall your operating system. Microsoft cannot
guarantee that you can solve problems that result from using Registry Editor
incorrectly. Use Registry Editor at your own risk.

The Windows NT global variable for the PoolTag registry value is
MmSpecialPoolTag:

  dd nt!MmSpecialPoolTag
  0x00000000 = No tag specified; Pool Tagging is basically disabled. (Default
  value)
  0x0000002a = Most typically used; used to look at all tags. This is the ASCII
  representation of the asterisk wildcard.

The Windows NT global variable for the PoolTagOverruns registry value is
MmSpecialPoolCatchOverruns:

  dd nt!MmSpecialPoolCatchOverruns
  0x00000000 = Underruns
  0x00000001 = Overruns (Default value)

The Windows NT global variable for the EnableKStackPool registry value is
MmEnableKStackPool.

This option is available only with Windows NT 4.0, Terminal Server Edition. For
additional information about this option, click the article number below to view
the article in the Microsoft Knowledge Base:

  Q188831 How to Enable the Special Pool Feature to Isolate Pool Damage

  dd nt!MmEnableKStackPool
  0x00000000 = KStack pool disabled.
  0x00000001 = KStack pool always enabled.
  0x00000002 = KStack pool enabled for >= 256 MB computers.

The Windows NT global variable MiSpecialPoolEnabled is hard coded to be enabled.

  LOGICAL MiSpecialPoolEnabled = TRUE;

  dd nt!MiSpecialPoolEnabled
  0x00000000 = Disabled
  0x00000001 = Enabled (Default value)

REFERENCES
==========

For additional information, click the article number below to view the article
in the Microsoft Knowledge Base:

  Q148658 How to Load Windows NT Memory.dmp File Using I386kd.exe

Additional query words:

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Keywords          : kbenv kbtool 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400search kbWinNT400search kbWinNTW400sp5 kbWinNTW400sp4 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp6 kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400search kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServSearch kbWinNTW400sp6 kbWinNTSEnt400SP6a kbWinNTW400SP6a
Version           : :4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Issue type        : kbinfo

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