Symptoms

Consider the following scenario:

  • You have a computer that is running Windows Server 2008 R2 or Windows 7.

  • You query for the value of the "Avg. Disk sec/Transfer" performance counter by using the RegQueryValueEx function.

In this scenario, a very large, incorrect value is returned by the function.

Note

  • This issue does not occur if you collect the value of the same performance counter by using the performance monitor utility.

  • This issue may occur if any application or any service uses the sample code that is described in the following MSDN article:

    Retrieving Counter DataFor example, you use System Center Operations Manager 2007 to monitor the health status of a Windows Server 2008 R2-based computer. You may receive wrong alerts for troubleshooting because of this issue.

Cause

This behavior occurs because of an issue in the volume manager driver (Volmgr.sys).

Some applications or services close the handle to HKEY_PERFORMANCE_DATA every time that the RegQueryValueEx function is called. Then, the disk counter is enabled or disabled intermittently by the kernel provider, and time stamps of some I/O request packets (IRPs) are not recorded when the disk counter is disabled. Therefore, not-valid data that does not have a time stamp is calculated and returned by the function.

Note In Windows Server 2008 R2 and in Windows 7, the disk counter in kernel provider can be dynamically enabled or disabled. If the handle to HKEY_PERFORMANCE_DATA is closed, the kernel provider disables I/O performance trace.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem that is described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows 7

  • Windows 7 with Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 with Service Pack 1 (SP1)

Registry information

You do not have to make any changes to the registry to use this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes


  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.20xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.17xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, very important issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Agp440.sys

6.1.7600.16385

53,312

14-Jul-2009

01:26

x86

Amdagp.sys

6.1.7600.16385

53,312

14-Jul-2009

01:26

x86

Isapnp.sys

6.1.7600.16385

46,656

14-Jul-2009

01:20

x86

Msisadrv.sys

6.1.7600.16385

13,888

14-Jul-2009

01:20

x86

Mssmbios.sys

6.1.7600.16385

28,240

14-Jul-2009

01:20

x86

Nv_agp.sys

6.1.7600.16385

105,024

14-Jul-2009

01:20

x86

Pci.sys

6.1.7600.20861

153,984

18-Dec-2010

05:35

x86

Sisagp.sys

6.1.7600.16385

52,304

14-Jul-2009

01:19

x86

Streamci.dll

6.1.7600.16385

22,096

14-Jul-2009

01:19

x86

Swenum.sys

6.1.7600.16385

12,240

14-Jul-2009

01:19

Not applicable

Termdd.sys

6.1.7600.20861

51,584

18-Dec-2010

05:35

x86

Uliagpkx.sys

6.1.7600.16385

57,424

14-Jul-2009

01:19

x86

Vdrvroot.sys

6.1.7600.16385

32,832

14-Jul-2009

01:19

x86

Viaagp.sys

6.1.7600.16385

53,328

14-Jul-2009

01:19

x86

Volmgr.sys

6.1.7600.20861

53,120

18-Dec-2010

05:35

x86

Agp440.sys

6.1.7600.16385

53,312

14-Jul-2009

01:26

x86

Amdagp.sys

6.1.7600.16385

53,312

14-Jul-2009

01:26

x86

Isapnp.sys

6.1.7600.16385

46,656

14-Jul-2009

01:20

x86

Msisadrv.sys

6.1.7600.16385

13,888

14-Jul-2009

01:20

x86

Mssmbios.sys

6.1.7600.16385

28,240

14-Jul-2009

01:20

x86

Nv_agp.sys

6.1.7600.16385

105,024

14-Jul-2009

01:20

x86

Pci.sys

6.1.7601.21624

153,984

18-Dec-2010

08:05

x86

Sisagp.sys

6.1.7600.16385

52,304

14-Jul-2009

01:19

x86

Streamci.dll

6.1.7600.16385

22,096

14-Jul-2009

01:19

x86

Swenum.sys

6.1.7600.16385

12,240

14-Jul-2009

01:19

Not applicable

Termdd.sys

6.1.7601.17514

53,120

20-Nov-2010

12:30

x86

Uliagpkx.sys

6.1.7600.16385

57,424

14-Jul-2009

01:19

x86

Vdrvroot.sys

6.1.7600.16385

32,832

14-Jul-2009

01:19

x86

Viaagp.sys

6.1.7600.16385

53,328

14-Jul-2009

01:19

x86

Volmgr.sys

6.1.7601.21624

53,120

18-Dec-2010

08:06

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Agp440.sys

6.1.7600.16385

61,008

14-Jul-2009

01:52

x64

Isapnp.sys

6.1.7600.16385

20,544

14-Jul-2009

01:48

x64

Msisadrv.sys

6.1.7600.16385

15,424

14-Jul-2009

01:48

x64

Mssmbios.sys

6.1.7600.16385

32,320

14-Jul-2009

01:48

x64

Nv_agp.sys

6.1.7600.16385

122,960

14-Jul-2009

01:48

x64

Pci.sys

6.1.7600.20861

184,704

18-Dec-2010

06:13

x64

Streamci.dll

6.1.7600.16385

24,144

14-Jul-2009

01:45

x64

Swenum.sys

6.1.7600.16385

12,496

14-Jul-2009

01:45

x64

Termdd.sys

6.1.7600.20861

62,336

18-Dec-2010

06:13

x64

Uliagpkx.sys

6.1.7600.16385

64,592

14-Jul-2009

01:45

x64

Vdrvroot.sys

6.1.7600.16385

36,432

14-Jul-2009

01:45

x64

Volmgr.sys

6.1.7600.20861

71,552

18-Dec-2010

06:13

x64

Agp440.sys

6.1.7600.16385

61,008

14-Jul-2009

01:52

x64

Isapnp.sys

6.1.7600.16385

20,544

14-Jul-2009

01:48

x64

Msisadrv.sys

6.1.7600.16385

15,424

14-Jul-2009

01:48

x64

Mssmbios.sys

6.1.7600.16385

32,320

14-Jul-2009

01:48

x64

Nv_agp.sys

6.1.7600.16385

122,960

14-Jul-2009

01:48

x64

Pci.sys

6.1.7601.21624

184,704

18-Dec-2010

08:56

x64

Streamci.dll

6.1.7600.16385

24,144

14-Jul-2009

01:45

x64

Swenum.sys

6.1.7600.16385

12,496

14-Jul-2009

01:45

x64

Termdd.sys

6.1.7601.17514

63,360

20-Nov-2010

13:33

x64

Uliagpkx.sys

6.1.7600.16385

64,592

14-Jul-2009

01:45

x64

Vdrvroot.sys

6.1.7600.16385

36,432

14-Jul-2009

01:45

x64

Volmgr.sys

6.1.7601.21624

70,528

18-Dec-2010

08:56

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Agp460.sys

6.1.7600.16385

137,216

13-Jul-2009

23:45

IA-64

Isapnp.sys

6.1.7600.16385

34,384

14-Jul-2009

01:58

IA-64

Msisadrv.sys

6.1.7600.16385

22,592

14-Jul-2009

01:58

IA-64

Mssmbios.sys

6.1.7600.16385

58,432

14-Jul-2009

01:58

IA-64

Pci.sys

6.1.7600.20861

455,552

18-Dec-2010

05:23

IA-64

Streamci.dll

6.1.7600.16385

43,072

14-Jul-2009

01:56

IA-64

Swenum.sys

6.1.7600.16385

16,192

14-Jul-2009

01:56

Not applicable

Termdd.sys

6.1.7600.20861

160,128

18-Dec-2010

05:23

IA-64

Vdrvroot.sys

6.1.7600.16385

66,112

14-Jul-2009

01:56

IA-64

Volmgr.sys

6.1.7600.20861

164,224

18-Dec-2010

05:23

IA-64

Agp460.sys

6.1.7600.16385

137,216

13-Jul-2009

23:45

IA-64

Isapnp.sys

6.1.7600.16385

34,384

14-Jul-2009

01:58

IA-64

Msisadrv.sys

6.1.7600.16385

22,592

14-Jul-2009

01:58

IA-64

Mssmbios.sys

6.1.7600.16385

58,432

14-Jul-2009

01:58

IA-64

Pci.sys

6.1.7601.17514

456,064

20-Nov-2010

10:33

IA-64

Streamci.dll

6.1.7600.16385

43,072

14-Jul-2009

01:56

IA-64

Swenum.sys

6.1.7600.16385

16,192

14-Jul-2009

01:56

Not applicable

Termdd.sys

6.1.7601.17514

162,688

20-Nov-2010

10:33

IA-64

Vdrvroot.sys

6.1.7600.16385

66,112

14-Jul-2009

01:56

IA-64

Volmgr.sys

6.1.7601.21624

164,224

18-Dec-2010

09:41

IA-64

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684

Description of the standard terminology that is used to describe Microsoft software updates

For more information about RegQueryValueEx function, visit the following Microsoft webpage:

RegQueryValueEx Function

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not applicable

File size

2,331

Date (UTC)

21-Dec-2010

Time (UTC)

01:43

Platform

Not applicable

File name

X86_machine.inf_31bf3856ad364e35_6.1.7600.20861_none_ba84867239156613.manifest

File version

Not applicable

File size

9,456

Date (UTC)

21-Dec-2010

Time (UTC)

01:46

Platform

Not applicable

File name

X86_machine.inf_31bf3856ad364e35_6.1.7601.21624_none_bc9924063618ae40.manifest

File version

Not applicable

File size

9,456

Date (UTC)

21-Dec-2010

Time (UTC)

01:46

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_machine.inf_31bf3856ad364e35_6.1.7600.20861_none_16a321f5f172d749.manifest

File version

Not applicable

File size

7,894

Date (UTC)

21-Dec-2010

Time (UTC)

01:49

Platform

Not applicable

File name

Amd64_machine.inf_31bf3856ad364e35_6.1.7601.21624_none_18b7bf89ee761f76.manifest

File version

Not applicable

File size

7,894

Date (UTC)

21-Dec-2010

Time (UTC)

01:49

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,347

Date (UTC)

21-Dec-2010

Time (UTC)

01:43

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_machine.inf_31bf3856ad364e35_6.1.7600.20861_none_ba862a6839136f0f.manifest

File version

Not applicable

File size

6,844

Date (UTC)

21-Dec-2010

Time (UTC)

01:44

Platform

Not applicable

File name

Ia64_machine.inf_31bf3856ad364e35_6.1.7601.21624_none_bc9ac7fc3616b73c.manifest

File version

Not applicable

File size

6,844

Date (UTC)

21-Dec-2010

Time (UTC)

01:44

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,933

Date (UTC)

21-Dec-2010

Time (UTC)

01:43

Platform

Not applicable

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