IRPStackSize parameter in Windows 2000 and Windows Server 2003 (285089)


The information in this article applies to:

  • Microsoft Windows Server 2003, Enterprise Edition
  • Microsoft Windows Server 2003, Standard Edition
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server
  • Microsoft Windows NT Server, Enterprise Edition 4.0
  • Microsoft Windows NT Server 4.0
  • Microsoft Windows NT Server 4.0 Terminal Server Edition
  • Microsoft Windows NT Workstation 4.0
This article was previously published under Q285089
Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry

SUMMARY

This article describes the functionality of the IRPStackSize parameter in Microsoft Windows 2000 Server and Microsoft Windows Server 2003.

MORE INFORMATION

IRPStackSize specifies the number of stack locations in I/O request packets (IRPs) used by Windows 2000 Server and Windows Server 2003. You may have to increase this number for certain transports, MAC drivers, or file system drivers. Each stack uses 36 bytes of memory for each receive buffer. This value is set in the following registry location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters

In Windows 2000 and Windows Server 2003, the default value of IRPStackSize is 15, and the range is from 11 to 32.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
If the key is not present, you can use Registry Editor to add it. To do this, follow these steps:
  1. Click Start, and then click Run.
  2. In the Open box, type regedit, and then click OK.
  3. Expand the following registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters

  4. Click Edit, point to New, and then click DWORD Value.
  5. Type IRPStackSize, and then press Enter to name the value.

    Note Type IRPStackSize exactly as it is displayed because the value name is case sensitive.
  6. Click Edit, and then click Modify.
  7. In the Data Value box, type the value appropriate for your network from the hexadecimal range 0xb to 0x20, and then click OK.
Modification Type:MinorLast Reviewed:5/15/2006
Keywords:kbinfo w2000perf KB285089 kbAudITPRO
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