Slow performance when you copy files to a file server from a virtual machine that is running Windows XP Mode on a Windows 7-based computer

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Article ID: 2697737 - View products that this article applies to.
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SYMPTOMS

Assume that you run a Windows XP Mode virtual machine in Shared Networking mode on a Windows 7-based computer. When you try to copy a file from the Windows XP Mode virtual machine to a file server, the file transfer speed is slow. Specifically, the file transfer speed is slower than the transfer speed when the computer is not running Windows XP Mode or when Windows XP Mode is not running in Shared Networking mode.

CAUSE

This issue occurs because Windows Virtual PC does not return a "TCP Windows update" ACK response to the guest operating system when Virtual PC successfully sends data to the remote host. Therefore, the guest operating system waits for 5 seconds before it sends the next packet.

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 website:
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 Windows 7 or Windows 7 Service Pack 1 (SP1). For more information about how to obtain a Windows 7 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You do not have to 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 file information note
Important Windows 7 and Windows Server 2008 R2 updates are included in the same packages.
  • 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
    VersionProductSR_LevelService branch
    6.1.760 0 . 20xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1 . 21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • The MANIFEST files (.manifest) that are installed for each environment are listed separately in the "Additional file information for Windows 7" section. 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 sizeDateTime
Vpc.exe6.1.7600.211803,330,56004-Apr-20124:32
Vpc.exe6.1.7601.219573,330,56004-Apr-20124:18
For all supported x64-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Vpc.exe6.1.7600.211804,514,81604-Apr-20125:19
Vpc.exe6.1.7601.219574,514,81604-Apr-20125:17

WORKAROUND

To work around this issue, configure bridge mode network in the Windows XP Mode.

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 Windows XP Mode, go to the following Microsoft website:
General information about Windows XP Mode
For more information about Windows Virtual PC, go to the following Microsoft website:
General information about Windows Virtual PC
For more information about the differences between Shared Networking and Virtual Switch Networking in Virtual PC, click the following article number to view the article in the Microsoft Knowledge Base:
824979 Differences between Shared Networking and Virtual Switch Networking in Virtual PC

Additional file information

Additional file information for Windows 7

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameX86_1bd410340a6a8369a68b7660d48a2c23_31bf3856ad364e35_7.1.7601.21957_none_b74602a0ecdee789.manifest
File versionNot Applicable
File size709
Date (UTC)04-Apr-2012
Time (UTC)9:31
File nameX86_a3404f2708b97a122bd5c854a12d5aad_31bf3856ad364e35_7.1.7600.21180_none_d17b81a7c4f86fa3.manifest
File versionNot Applicable
File size709
Date (UTC)04-Apr-2012
Time (UTC)9:31
File nameX86_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7600.21180_none_abf9f091643b7c58.manifest
File versionNot Applicable
File size144,595
Date (UTC)04-Apr-2012
Time (UTC)5:01
File nameX86_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7601.21957_none_ae07e92561430fb7.manifest
File versionNot Applicable
File size144,595
Date (UTC)04-Apr-2012
Time (UTC)4:47
Additional files for all supported x64-based versions of Windows 7
Collapse this tableExpand this table
File nameAmd64_92d989ef9048400788207cad0cd700de_31bf3856ad364e35_7.1.7601.21957_none_8cb5ed002d930fb3.manifest
File versionNot Applicable
File size713
Date (UTC)04-Apr-2012
Time (UTC)9:31
File nameAmd64_b6f36390cb5fe1398ce7cf9e0295c0a0_31bf3856ad364e35_7.1.7600.21180_none_2489e92b3d30ff21.manifest
File versionNot Applicable
File size713
Date (UTC)04-Apr-2012
Time (UTC)9:31
File nameAmd64_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7600.21180_none_08188c151c98ed8e.manifest
File versionNot Applicable
File size144,599
Date (UTC)04-Apr-2012
Time (UTC)5:54
File nameAmd64_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7601.21957_none_0a2684a919a080ed.manifest
File versionNot Applicable
File size144,599
Date (UTC)04-Apr-2012
Time (UTC)5:49

Properties

Article ID: 2697737 - Last Review: May 9, 2012 - Revision: 2.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertisebeginner KB2697737

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