Determining Special Pool Tagging Options When Debugging

ID: Q250453

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

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

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 Enable 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: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

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:

Keywords : kbenv kbtool
Version : winnt:4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Platform : winnt
Issue type : kbinfo