An update for the Msahci.sys driver has been released for AMD chipsets

Introduction

This article discusses an update for the Microsoft Advanced Host Controller Interface (AHCI) driver, Msahci.sys. This driver was specifically built for the Serial Advanced Technology Attachment (SATA) mode of a disk device. The update changes the Msahci.sys driver so that the driver does not call RecordExecutionHistory(), which is called at various times, such as after each command execution. This function copies the AHCI registers into an execution history buffer for debugging. This copy activity can decrease the performance of AMD-based CPU chipsets because Msahci.sys logs entries every time that it is executed.

More 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=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, your computer must be running one of the following 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 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 How to obtain the latest service pack for Windows Server 2008

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.

The global version of this hotfix uses a Microsoft Windows Installer package to install the hotfix. The dates and the times for these files are listed in Coordinated Universal Time (UTC) in the following table. When you view the file information, the date 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

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.

    Version

    Product

    Milestone

    Service branch

    6.0.6001.22xxx

    Windows Vista SP1 and Windows Server 2008 SP1

    SP1

    LDR

    6.0.6002.22xxx

    Windows Vista SP2 and Windows Server 2008 SP2

    SP2

    LDR

  • 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. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Aliide.sys

1.2.0.0

14,408

22-Sep-2009

13:04

x86

Aliide.sys

1.2.0.0

14,392

22-Sep-2009

13:02

x86

Amdide.sys

6.0.6001.22528

14,920

22-Sep-2009

13:04

x86

Amdide.sys

6.0.6002.22230

14,904

22-Sep-2009

13:02

x86

Atapi.sys

6.0.6001.22528

21,064

22-Sep-2009

13:04

x86

Atapi.sys

6.0.6002.22230

21,048

22-Sep-2009

13:02

x86

Ataport.sys

6.0.6001.22528

107,592

22-Sep-2009

13:04

x86

Ataport.sys

6.0.6002.22230

107,576

22-Sep-2009

13:02

x86

Cmdide.sys

2.0.7.0

15,944

22-Sep-2009

13:04

x86

Cmdide.sys

2.0.7.0

15,928

22-Sep-2009

13:02

x86

Intelide.sys

6.0.6001.22528

14,920

22-Sep-2009

13:05

x86

Intelide.sys

6.0.6002.22230

14,904

22-Sep-2009

13:02

x86

Msahci.sys

6.0.6001.22528

25,672

22-Sep-2009

13:05

x86

Msahci.sys

6.0.6002.22230

25,656

22-Sep-2009

13:03

x86

Pciide.sys

6.0.6001.22528

13,384

22-Sep-2009

13:05

x86

Pciide.sys

6.0.6002.22230

13,368

22-Sep-2009

13:03

x86

Pciidex.sys

6.0.6001.22528

42,056

22-Sep-2009

13:05

x86

Pciidex.sys

6.0.6002.22230

42,040

22-Sep-2009

13:03

x86

Viaide.sys

5.1.3790.150

16,968

22-Sep-2009

13:05

x86

Viaide.sys

5.1.3790.150

16,952

22-Sep-2009

13:03

x86

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

File name

File version

File size

Date

Time

Platform

Aliide.sys

1.2.0.0

15,432

22-Sep-2009

13:27

x64

Amdide.sys

6.0.6001.22528

15,432

22-Sep-2009

13:27

x64

Amdide.sys

6.0.6002.22230

15,416

22-Sep-2009

12:42

x64

Atapi.sys

6.0.6001.22528

23,624

22-Sep-2009

13:27

x64

Atapi.sys

6.0.6002.22230

23,608

22-Sep-2009

12:42

x64

Ataport.sys

6.0.6001.22528

121,928

22-Sep-2009

13:27

x64

Ataport.sys

6.0.6002.22230

121,912

22-Sep-2009

12:42

x64

Cmdide.sys

2.0.7.0

17,480

22-Sep-2009

13:27

x64

Cmdide.sys

2.0.7.0

17,464

22-Sep-2009

12:43

x64

Intelide.sys

6.0.6001.22528

16,456

22-Sep-2009

13:27

x64

Intelide.sys

6.0.6002.22230

16,440

22-Sep-2009

12:43

x64

Msahci.sys

6.0.6001.22528

28,232

22-Sep-2009

13:27

x64

Msahci.sys

6.0.6002.22230

28,216

22-Sep-2009

12:43

x64

Pciide.sys

6.0.6001.22528

13,384

22-Sep-2009

13:27

x64

Pciide.sys

6.0.6002.22230

13,368

22-Sep-2009

12:43

x64

Pciidex.sys

6.0.6001.22528

48,200

22-Sep-2009

13:27

x64

Pciidex.sys

6.0.6002.22230

48,184

22-Sep-2009

12:43

x64

Viaide.sys

5.1.3790.150

17,480

22-Sep-2009

13:28

x64

Viaide.sys

5.1.3790.150

17,464

22-Sep-2009

12:43

x64

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

File name

File version

File size

Date

Time

Platform

Aliide.sys

1.2.0.0

19,016

22-Sep-2009

13:02

IA-64

Aliide.sys

1.2.0.0

19,000

22-Sep-2009

12:45

IA-64

Atapi.sys

6.0.6001.22528

44,616

22-Sep-2009

13:02

IA-64

Atapi.sys

6.0.6002.22230

44,600

22-Sep-2009

12:45

IA-64

Ataport.sys

6.0.6001.22528

305,736

22-Sep-2009

13:02

IA-64

Ataport.sys

6.0.6002.22230

305,720

22-Sep-2009

12:45

IA-64

Cmdide.sys

2.0.7.0

26,696

22-Sep-2009

13:02

IA-64

Cmdide.sys

2.0.7.0

26,680

22-Sep-2009

12:45

IA-64

Intelide.sys

6.0.6001.22528

21,064

22-Sep-2009

13:02

IA-64

Intelide.sys

6.0.6002.22230

21,048

22-Sep-2009

12:45

IA-64

Msahci.sys

6.0.6001.22528

59,976

22-Sep-2009

13:02

IA-64

Msahci.sys

6.0.6002.22230

59,960

22-Sep-2009

12:46

IA-64

Pciide.sys

6.0.6001.22528

18,504

22-Sep-2009

13:02

IA-64

Pciide.sys

6.0.6002.22230

18,488

22-Sep-2009

12:46

IA-64

Pciidex.sys

6.0.6001.22528

108,616

22-Sep-2009

13:02

IA-64

Pciidex.sys

6.0.6002.22230

108,600

22-Sep-2009

12:46

IA-64

Viaide.sys

5.1.3790.150

28,232

22-Sep-2009

13:02

IA-64

Viaide.sys

5.1.3790.150

28,216

22-Sep-2009

12:46

IA-64

Status

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

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

File name

Package_1_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,805

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_2_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,972

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_3_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,810

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_4_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,810

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_5_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,460

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_6_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,299

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_7_for_kb974073~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,299

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,367

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_client_2~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,694

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_client~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,713

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,421

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,690

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,701

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,694

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,713

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,422

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

X86_mshdc.inf_31bf3856ad364e35_6.0.6001.22528_none_ddb42ef53ab0659c.manifest

File version

Not Applicable

File size

6,874

Date (UTC)

23-Sep-2009

Time (UTC)

07:18

File name

X86_mshdc.inf_31bf3856ad364e35_6.0.6002.22230_none_df87cea137e60bf9.manifest

File version

Not Applicable

File size

6,874

Date (UTC)

23-Sep-2009

Time (UTC)

07:18

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

File name

Amd64_mshdc.inf_31bf3856ad364e35_6.0.6001.22528_none_39d2ca78f30dd6d2.manifest

File version

Not Applicable

File size

6,876

Date (UTC)

23-Sep-2009

Time (UTC)

07:33

File name

Amd64_mshdc.inf_31bf3856ad364e35_6.0.6002.22230_none_3ba66a24f0437d2f.manifest

File version

Not Applicable

File size

6,876

Date (UTC)

23-Sep-2009

Time (UTC)

07:33

File name

Package_1_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,815

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_2_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,984

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_3_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,820

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_4_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,820

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_5_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,478

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_6_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,315

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_7_for_kb974073~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,315

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,375

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_client_2~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,706

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_client~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,723

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,429

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,702

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,711

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,433

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,706

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,723

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,438

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

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

File name

Ia64_mshdc.inf_31bf3856ad364e35_6.0.6001.22528_none_ddb5d2eb3aae6e98.manifest

File version

Not Applicable

File size

6,297

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Ia64_mshdc.inf_31bf3856ad364e35_6.0.6002.22230_none_df89729737e414f5.manifest

File version

Not Applicable

File size

6,297

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_1_for_kb974073~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,810

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_2_for_kb974073~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,815

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_3_for_kb974073~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,815

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_4_for_kb974073~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

2,140

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_5_for_kb974073~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

2,140

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc_1~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,530

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_sc~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,706

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,429

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server_1~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,533

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_server~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,718

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_winpesrv_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,426

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

File name

Package_for_kb974073_winpesrv~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,434

Date (UTC)

23-Sep-2009

Time (UTC)

07:11

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