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Article ID: 975798 - Last Review: February 19, 2010 - Revision: 2.1

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SYMPTOMS

You run Internet Information Services (IIS) 7.0 on a computer that is running Windows Vista or Windows Server 2008. The computer has more than 64 GB RAM. Unexpectedly, the W3wp.exe IIS process consumes 100% of CPU resources. Therefore, the computer experiences low performance.

CAUSE

This problem occurs because the highest memory address of the kernel mode HTTP driver (Http.sys) is defined as 64GB.

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 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:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
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)
For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:
935791  (http://support.microsoft.com/kb/935791/ ) How to obtain the latest Windows Vista service pack
For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
968849  (http://support.microsoft.com/kb/968849/ ) How to obtain the latest service pack for Windows Server 2008

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

Installation instructions

File information

The English (United States) 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 Vista and Windows Server 2008 file information notes


Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" 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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.0.600 1 . 22xxxWindows Vista and Windows Server 2008SP1LDR
    6.0.600 2 . 22xxxWindows Vista and Windows Server 2008SP2LDR
  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
  • 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 and for Windows Vista" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. 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 Server 2008 and of Windows Vista

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Httpapi.dll6.0.6001.2256431,23216-Nov-200914:09x86
Httpapi.dll6.0.6002.2226830,72016-Nov-200914:00x86
Http.sys6.0.6001.22564411,13616-Nov-200912:06x86
Http.sys6.0.6002.22268411,64816-Nov-200911:59x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Httpapi.dll6.0.6001.2256433,79216-Nov-200914:46x64
Httpapi.dll6.0.6002.2226833,79216-Nov-200913:58x64
Http.sys6.0.6001.22564609,79216-Nov-200912:31x64
Http.sys6.0.6002.22268620,03216-Nov-200912:14x64
For all supported IA-64-based versions of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Httpapi.dll6.0.6001.2256470,65616-Nov-200916:31IA-64
Httpapi.dll6.0.6002.2226870,65616-Nov-200913:52IA-64
Http.sys6.0.6001.225641,176,57616-Nov-200912:23IA-64
Http.sys6.0.6002.222681,176,57616-Nov-200912:16IA-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  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Vista and for Windows Server 2008


Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Package_for_kb975798_client_1~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,36717-Nov-200908:34Not Applicable
Package_for_kb975798_client_2~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,96917-Nov-200908:34Not Applicable
Package_for_kb975798_client~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,71317-Nov-200908:34Not Applicable
Package_for_kb975798_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,42117-Nov-200908:34Not Applicable
Package_for_kb975798_sc_1~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,96617-Nov-200908:34Not Applicable
Package_for_kb975798_sc~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,70117-Nov-200908:34Not Applicable
Package_for_kb975798_server_0~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,42517-Nov-200908:34Not Applicable
Package_for_kb975798_server_1~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,96917-Nov-200908:34Not Applicable
Package_for_kb975798_server~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,71317-Nov-200908:34Not Applicable
Package_for_kb975798_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,42217-Nov-200908:34Not Applicable
Package_for_kb975798_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mumNot Applicable1,43017-Nov-200908:34Not Applicable
X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6001.22564_none_f5f90302b6967b3b.manifestNot Applicable4,70816-Nov-200917:34Not Applicable
X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22268_none_f7e37612b3b935bb.manifestNot Applicable4,70816-Nov-200916:00Not Applicable
X86_microsoft-windows-http_31bf3856ad364e35_6.0.6001.22564_none_ad0dc24c32258e80.manifestNot Applicable144,30416-Nov-200917:36Not Applicable
X86_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22268_none_aef8355c2f484900.manifestNot Applicable144,70316-Nov-200916:02Not Applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Amd64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6001.22564_none_52179e866ef3ec71.manifestNot Applicable4,72216-Nov-200918:59Not Applicable
Amd64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22268_none_540211966c16a6f1.manifestNot Applicable4,72216-Nov-200918:41Not Applicable
Amd64_microsoft-windows-http_31bf3856ad364e35_6.0.6001.22564_none_092c5dcfea82ffb6.manifestNot Applicable144,56816-Nov-200919:01Not Applicable
Amd64_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22268_none_0b16d0dfe7a5ba36.manifestNot Applicable144,96716-Nov-200918:43Not Applicable
Package_for_kb975798_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,37517-Nov-200908:34Not Applicable
Package_for_kb975798_client_2~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,98317-Nov-200908:34Not Applicable
Package_for_kb975798_client~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,72317-Nov-200908:34Not Applicable
Package_for_kb975798_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,42917-Nov-200908:34Not Applicable
Package_for_kb975798_sc_1~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,98017-Nov-200908:34Not Applicable
Package_for_kb975798_sc~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,71117-Nov-200908:34Not Applicable
Package_for_kb975798_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,43317-Nov-200908:34Not Applicable
Package_for_kb975798_server_1~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,98317-Nov-200908:34Not Applicable
Package_for_kb975798_server~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,72317-Nov-200908:34Not Applicable
Package_for_kb975798_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,43017-Nov-200908:34Not Applicable
Package_for_kb975798_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mumNot Applicable1,43817-Nov-200908:34Not Applicable
X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6001.22564_none_f5f90302b6967b3b.manifestNot Applicable4,70816-Nov-200917:34Not Applicable
X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22268_none_f7e37612b3b935bb.manifestNot Applicable4,70816-Nov-200916:00Not Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ia64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6001.22564_none_f5faa6f8b6948437.manifestNot Applicable4,71517-Nov-200902:12Not Applicable
Ia64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22268_none_f7e51a08b3b73eb7.manifestNot Applicable4,71516-Nov-200915:17Not Applicable
Ia64_microsoft-windows-http_31bf3856ad364e35_6.0.6001.22564_none_ad0f66423223977c.manifestNot Applicable144,55817-Nov-200902:14Not Applicable
Ia64_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22268_none_aef9d9522f4651fc.manifestNot Applicable144,95716-Nov-200915:18Not Applicable
Package_for_kb975798_sc_0~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,42517-Nov-200908:34Not Applicable
Package_for_kb975798_sc_1~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,80617-Nov-200908:34Not Applicable
Package_for_kb975798_sc~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,70617-Nov-200908:34Not Applicable
Package_for_kb975798_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,42917-Nov-200908:34Not Applicable
Package_for_kb975798_server_1~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,80917-Nov-200908:34Not Applicable
Package_for_kb975798_server~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,71817-Nov-200908:34Not Applicable
Package_for_kb975798_winpesrv_0~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,42617-Nov-200908:34Not Applicable
Package_for_kb975798_winpesrv~31bf3856ad364e35~ia64~~6.0.1.0.mumNot Applicable1,43417-Nov-200908:34Not Applicable
X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6001.22564_none_f5f90302b6967b3b.manifestNot Applicable4,70816-Nov-200917:34Not Applicable
X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22268_none_f7e37612b3b935bb.manifestNot Applicable4,70816-Nov-200916:00Not Applicable

APPLIES TO
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Web Server 2008
  • Windows HPC Server 2008
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Premium
  • Windows Vista Ultimate
Keywords: 
kbqfe kbhotfixserver kbsurveynew kbautohotfix kbexpertiseinter kbexpertiseadvanced kbbug kbfix KB975798
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