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Article ID: 2564236 - Last Review: August 10, 2011 - Revision: 1.0

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SYMPTOMS

I/O throughput is low when you run an I/O-intensive application that reads large files sequentially on a computer that is running Windows 7 or Windows Server 2008 R2.

Note This issue usually occurs when the application performs a backward search on a file that was opened without a hint flag (for example, FILE_FLAG_RANDOM_ACCESS or FILE_FLAG_SEQUENTIAL_SCAN).

CAUSE

This issue occurs because of a coding error. This error causes Cache Manager not to schedule data prefetching (read-ahead operations) after a backward seek is performed in a file. This behavior occurs even if Cache Manager detects a sequential read pattern.

Note When a file does not have a random-access or sequential-scan flag, Cache Manager tries to determine the read pattern from the last three file read events.

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, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932  (http://support.microsoft.com/kb/976932/ ) Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

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:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 0.21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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 x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntkrnlpa.exe6.1.7600.210083,967,87214-Jul-201104:36x86
Ntoskrnl.exe6.1.7600.210083,911,55214-Jul-201104:36x86
Ntkrnlpa.exe6.1.7601.217703,967,87214-Jul-201105:55x86
Ntoskrnl.exe6.1.7601.217703,912,57614-Jul-201105:55x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.210085,474,68814-Jul-201105:33x64
Ntoskrnl.exe6.1.7601.217705,561,72814-Jul-201105:27x64
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.2100811,133,82414-Jul-201104:18IA-64
Ntoskrnl.exe6.1.7601.2177011,119,48814-Jul-201104:12IA-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 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot applicable
File size2,773
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameX86_0301549c74d808e169c7a9657c8a61ff_31bf3856ad364e35_6.1.7600.21008_none_d47b11d0c5bf4a1e.manifest
File versionNot applicable
File size717
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameX86_44a208f28e92c19753a452361eb0b37f_31bf3856ad364e35_6.1.7601.21770_none_eefa3c0acb499007.manifest
File versionNot applicable
File size697
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameX86_68746c27605830ea35b0beb4a356cbb4_31bf3856ad364e35_6.1.7600.21008_none_3814c0539b95a8ba.manifest
File versionNot applicable
File size697
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21008_none_6ce9b66d2e50d925.manifest
File versionNot applicable
File size16,151
Date (UTC)14-Jul-2011
Time (UTC)05:19
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21770_none_6e7c898d2bb70aae.manifest
File versionNot applicable
File size16,151
Date (UTC)14-Jul-2011
Time (UTC)06:24
PlatformNot applicable
File nameX86_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21008_none_84b74e5fa895e3bf.manifest
File versionNot applicable
File size8,047
Date (UTC)14-Jul-2011
Time (UTC)05:08
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_06be7b559ee56014d6e1faff37c92008_31bf3856ad364e35_6.1.7600.21008_none_c1bf76c375ddcdea.manifest
File versionNot applicable
File size721
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_2ce651a7f7b204c833e3ab931f2df088_31bf3856ad364e35_6.1.7600.21008_none_ccb162c7ec7a174e.manifest
File versionNot applicable
File size1,042
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_44a208f28e92c19753a452361eb0b37f_31bf3856ad364e35_6.1.7601.21770_none_4b18d78e83a7013d.manifest
File versionNot applicable
File size699
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_5f4667fd0bb8ffd6cc3563b47ef89305_31bf3856ad364e35_6.1.7600.21008_none_ff7d8b689f086af8.manifest
File versionNot applicable
File size701
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_68746c27605830ea35b0beb4a356cbb4_31bf3856ad364e35_6.1.7600.21008_none_94335bd753f319f0.manifest
File versionNot applicable
File size699
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_b17bce3c4025ee8b4c9075f81982821e_31bf3856ad364e35_6.1.7601.21770_none_e1c8c072092ba730.manifest
File versionNot applicable
File size1,042
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_e1d96c5050d6577f912babe35b4853bd_31bf3856ad364e35_6.1.7601.21770_none_70fe821f025445a8.manifest
File versionNot applicable
File size701
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21008_none_c90851f0e6ae4a5b.manifest
File versionNot applicable
File size15,291
Date (UTC)14-Jul-2011
Time (UTC)06:36
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21770_none_ca9b2510e4147be4.manifest
File versionNot applicable
File size15,291
Date (UTC)14-Jul-2011
Time (UTC)07:09
PlatformNot applicable
File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21008_none_e0d5e9e360f354f5.manifest
File versionNot applicable
File size8,049
Date (UTC)14-Jul-2011
Time (UTC)06:18
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size3,215
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_0d1138904ec6785c828144e6ff874f9a_31bf3856ad364e35_6.1.7600.21008_none_a62f3c31482f9530.manifest
File versionNot applicable
File size699
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameIa64_238e65cd24c9dcf0f081c32ebd97e5b5_31bf3856ad364e35_6.1.7600.21008_none_a858d29401992212.manifest
File versionNot applicable
File size719
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameIa64_44a208f28e92c19753a452361eb0b37f_31bf3856ad364e35_6.1.7601.21770_none_eefbe000cb479903.manifest
File versionNot applicable
File size698
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameIa64_68746c27605830ea35b0beb4a356cbb4_31bf3856ad364e35_6.1.7600.21008_none_381664499b93b1b6.manifest
File versionNot applicable
File size698
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameIa64_76efbdd2c963fe822cb610e38f008955_31bf3856ad364e35_6.1.7601.21770_none_e029168e4b40260e.manifest
File versionNot applicable
File size699
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21008_none_6ceb5a632e4ee221.manifest
File versionNot applicable
File size15,289
Date (UTC)14-Jul-2011
Time (UTC)06:03
PlatformNot applicable
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21770_none_6e7e2d832bb513aa.manifest
File versionNot applicable
File size15,289
Date (UTC)14-Jul-2011
Time (UTC)07:08
PlatformNot applicable
File nameIa64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21008_none_84b8f255a893ecbb.manifest
File versionNot applicable
File size8,048
Date (UTC)14-Jul-2011
Time (UTC)05:53
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,170
Date (UTC)14-Jul-2011
Time (UTC)17:51
PlatformNot applicable

APPLIES TO
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter KB2564236
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