File copying from down-level systems to Windows Vista or Windows Server 2008 is significantly slower if Intel I/OAT is enabled

Consider the following scenario:

• You have a computer that is running Windows Vista or Windows Server 2008.
• Intel I/O Acceleration Technology (I/OAT) is enabled on the computer.
• You copy files to this computer from another computer that is running a down-level operating system, such as Windows XP and Windows Server 2003.

In this scenario, the file copying is significantly slower than when Intel I/O Acceleration Technology is disabled.

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

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 Global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table.

Windows Vista and Windows Server 2008 file information notes

• 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

  Version	Product	SR_Level	Service branch
  6.0.6000.16xxx	Windows Vista	RTM	GDR
  6.0.6000.20xxx	Windows Vista	RTM	LDR
  6.0.6001.18xxx	Windows Vista and Windows Server 2008	SP1	GDR
  6.0.6001.22xxx	Windows Vista and Windows Server 2008	SP1	LDR
  6.0.6002.18xxx	Windows Vista and Windows Server 2008	SP2	GDR
  6.0.6002.22xxx	Windows Vista and Windows Server 2008	SP2	LDR

• Service Pack 1 is integrated into the original release of Windows Server 2008.
• The MANIFEST files (.manifest) and MUM files (.mum) 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.

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.

For all supported x86-based versions of Windows Server 2008

For all supported x64-based versions of Windows Server 2008

For all supported Itanium-based versions of Windows Server 2008

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

Intel I/OAT, together with the network direct memory access (NetDMA) feature in Windows Vista Service Pack 1 or Windows Server 2008, provides direct memory access to memory by network-intensive applications. This significantly reduces the CPU load by reducing memory copying during networking operations. For Intel I/OAT to work, it must be enabled in both the BIOS and the operating system. By default, Intel I/OAT is disabled.

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

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.