You experience high CPU utilization when an application uses the IPMI driver to communicate with the baseboard management controller on a computer that is running Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2

Applies to: Windows Vista UltimateWindows Vista Home PremiumWindows Vista Home Basic More

Symptoms


On a computer that is running Windows Vista, Windows Server 2008 Windows 7 or Windows Server 2008 R2, an application uses the Intelligent Platform Management Interface (IPMI) driver to communicate with the baseboard management controller (BMC). However, even when the system is almost idle, you experience high CPU utilization in this situation. Sometimes, CPU utilization may grow to 50 percent of system resources.

Note: The hotfix packages below supersede the previous released hotfix for Windows Vista and Windows Server 2008. The first version of the hotfix package included a regression that could cause a stall during the stop error. As a result, a Dump file may not be generated.This issue does not effect the Windows 7 or Windows Server 2008 R2 versions of the packages.

Cause


This problem occurs because the IPMI driver unexpectedly stalls a thread for a long time.

Resolution


Hotfix information

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

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 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 Web site: Note 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, your computer must be running one of the following Windows operating systems:
  • Windows Vista Service Pack 1 (SP1)
  • Windows Vista Service Pack 2 (SP2)
  • Windows Server 2008
  • Windows Server 2008 Service Pack 2 (SP2)
  • Windows 7
  • Windows Server 2008 R2

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

935791 How to obtain the latest Windows Vista service pack

No prerequisites are required for Windows Server 2008-based computers.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista and Windows Server 2008 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 fileversion numbers as shown in the following table.
    VersionProductMilestoneService branch
    6.0.6001.18xxxWindows Vista SP1 and Windows Server 2008SP1SP1GDR
    6.0.6001.22xxxWindows Vista SP1 and Windows Server 2008SP1SP1LDR
    6.0.6002.18xxxWindows Vista SP2 and Windows Server 2008SP2SP2GDR
    6.0.6002.22xxxWindows Vista SP2 and Windows Server 2008SP2SP2LDR
  • Service Pack 1 is integrated into Windows Server 2008.
  • The MANIFEST files (.manifest) and the MUM files (.mum)that are installed for each environment are listed separately. MUM and MANIFEST files, andthe associated security catalog (.cat) files, are critical to maintaining thestate of the updated component. The security catalog files (attributes notlisted) are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Ipmidrv.sys6.0.6001.2256765,53619-Nov-200915:00x86
Ipmidrv.sys6.0.6002.2227265,53619-Nov-200915:01x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Ipmidrv.sys6.0.6001.2256777,31219-Nov-200915:23x64
Ipmidrv.sys6.0.6002.2227277,31219-Nov-200915:12x64
For all supported Itanium-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Ipmidrv.sys6.0.6001.22567162,30419-Nov-200915:08IA-64
Ipmidrv.sys6.0.6002.22272162,30419-Nov-200915:09IA-64
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • 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:
    VersionProductMilestoneService branch
    6.1.760
    0.20xxx
    Windows 7 and Windows Server 2008 R2RTMLDR
  • 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 extremely important to maintain 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 x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Ipmidrv.sys6.1.7600.2081078,84806-Oct-201003:08x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Ipmidrv.sys6.1.7600.20810168,44806-Oct-201002:34IA-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

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Package_1_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,81120-Nov-200912:21Not Applicable
Package_2_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,97820-Nov-200912:21Not Applicable
Package_3_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,81620-Nov-200912:21Not Applicable
Package_4_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,81620-Nov-200912:21Not Applicable
Package_5_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable2,46620-Nov-200912:21Not Applicable
Package_6_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable2,30520-Nov-200912:21Not Applicable
Package_7_for_kb970360~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable2,30520-Nov-200912:21Not Applicable
Package_for_kb970360_client_1~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,36720-Nov-200912:21Not Applicable
Package_for_kb970360_client_2~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,69420-Nov-200912:21Not Applicable
Package_for_kb970360_client~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,71320-Nov-200912:21Not Applicable
Package_for_kb970360_sc_0~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,42120-Nov-200912:21Not Applicable
Package_for_kb970360_sc_1~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,69020-Nov-200912:21Not Applicable
Package_for_kb970360_sc~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,70120-Nov-200912:21Not Applicable
Package_for_kb970360_server_0~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,42520-Nov-200912:21Not Applicable
Package_for_kb970360_server_1~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,69420-Nov-200912:21Not Applicable
Package_for_kb970360_server~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,71320-Nov-200912:21Not Applicable
Package_for_kb970360_winpesrv_0~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,42220-Nov-200912:21Not Applicable
Package_for_kb970360_winpesrv~31bf3856ad364e35~x86~~6.0.2.0.mumNot Applicable1,43020-Nov-200912:21Not Applicable
X86_ipmidrv.inf_31bf3856ad364e35_6.0.6001.22567_none_fbf8b8d304da4747.manifestNot Applicable1,67420-Nov-200912:27Not Applicable
X86_ipmidrv.inf_31bf3856ad364e35_6.0.6002.22272_none_fdcf595d020d39a9.manifestNot Applicable1,67420-Nov-200912:27Not Applicable
Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Amd64_ipmidrv.inf_31bf3856ad364e35_6.0.6001.22567_none_58175456bd37b87d.manifestNot Applicable1,67620-Nov-200912:35Not Applicable
Amd64_ipmidrv.inf_31bf3856ad364e35_6.0.6002.22272_none_59edf4e0ba6aaadf.manifestNot Applicable1,67620-Nov-200912:35Not Applicable
Package_1_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,82120-Nov-200912:21Not Applicable
Package_2_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,99020-Nov-200912:21Not Applicable
Package_3_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,82620-Nov-200912:21Not Applicable
Package_4_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,82620-Nov-200912:21Not Applicable
Package_5_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable2,48420-Nov-200912:21Not Applicable
Package_6_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable2,32120-Nov-200912:21Not Applicable
Package_7_for_kb970360~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable2,32120-Nov-200912:21Not Applicable
Package_for_kb970360_client_1~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,37520-Nov-200912:21Not Applicable
Package_for_kb970360_client_2~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,70620-Nov-200912:21Not Applicable
Package_for_kb970360_client~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,72320-Nov-200912:21Not Applicable
Package_for_kb970360_sc_0~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,42920-Nov-200912:21Not Applicable
Package_for_kb970360_sc_1~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,70220-Nov-200912:21Not Applicable
Package_for_kb970360_sc~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,71120-Nov-200912:21Not Applicable
Package_for_kb970360_server_0~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,43320-Nov-200912:21Not Applicable
Package_for_kb970360_server_1~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,70620-Nov-200912:21Not Applicable
Package_for_kb970360_server~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,72320-Nov-200912:21Not Applicable
Package_for_kb970360_winpesrv_0~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,43020-Nov-200912:21Not Applicable
Package_for_kb970360_winpesrv~31bf3856ad364e35~amd64~~6.0.2.0.mumNot Applicable1,43820-Nov-200912:21Not Applicable
Additional files for all supported Itanium-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Ia64_ipmidrv.inf_31bf3856ad364e35_6.0.6001.22567_none_fbfa5cc904d85043.manifestNot Applicable1,67520-Nov-200912:21Not Applicable
Ia64_ipmidrv.inf_31bf3856ad364e35_6.0.6002.22272_none_fdd0fd53020b42a5.manifestNot Applicable1,67520-Nov-200912:21Not Applicable
Package_1_for_kb970360~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,81620-Nov-200912:21Not Applicable
Package_2_for_kb970360~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,82120-Nov-200912:21Not Applicable
Package_3_for_kb970360~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,82120-Nov-200912:21Not Applicable
Package_4_for_kb970360~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable2,14620-Nov-200912:21Not Applicable
Package_5_for_kb970360~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable2,14620-Nov-200912:21Not Applicable
Package_for_kb970360_sc_0~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,42520-Nov-200912:21Not Applicable
Package_for_kb970360_sc_1~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,53020-Nov-200912:21Not Applicable
Package_for_kb970360_sc~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,70620-Nov-200912:21Not Applicable
Package_for_kb970360_server_0~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,42920-Nov-200912:21Not Applicable
Package_for_kb970360_server_1~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,53320-Nov-200912:21Not Applicable
Package_for_kb970360_server~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,71820-Nov-200912:21Not Applicable
Package_for_kb970360_winpesrv_0~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,42620-Nov-200912:21Not Applicable
Package_for_kb970360_winpesrv~31bf3856ad364e35~ia64~~6.0.2.0.mumNot Applicable1,43420-Nov-200912:21Not Applicable

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

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_ipmidrv.inf_31bf3856ad364e35_6.1.7600.20810_none_586e35fe1e2cb29d.manifest
File versionNot Applicable
File size2,091
Date (UTC)06-Oct-2010
Time (UTC)05:56
PlatformNot Applicable
File namePackage_1_for_kb970360~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,846
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
File namePackage_2_for_kb970360~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,846
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
File namePackage_3_for_kb970360~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,845
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
File namePackage_for_kb970360_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,203
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,652
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_ipmidrv.inf_31bf3856ad364e35_6.1.7600.20810_none_fc513e7065cd4a63.manifest
File versionNot Applicable
File size2,089
Date (UTC)06-Oct-2010
Time (UTC)05:58
PlatformNot Applicable
File namePackage_1_for_kb970360~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,841
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
File namePackage_for_kb970360_rtm~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,444
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,445
Date (UTC)06-Oct-2010
Time (UTC)07:33
PlatformNot Applicable