WDS has a high CPU usage when many client computers try to start in Windows Server 2012 R2

This article describes an issue that occurs in Windows Server 2012 R2 that has Windows Deployment Services (WDS) installed. You can fix this issue by using the update in this article. Before you install this update, check out the Prerequisites section.

Symptoms

This issue occurs when many client computers try to start over Trivial File Transfer Protocol (TFTP) on a multi-core system. Instead of using multiple CPU cores, all WDS threads are spinning at a high CPU usage, and TFTP transfers slow down to the point of start timeouts.

How to get this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is available on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following file is available for download from the Microsoft Download Center:

Download Download the update for Windows Server 2012 R2 package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

Prerequisites

To apply this update, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows Server 2012 R2.

Registry information

To install this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.
File information

Status

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

References

See the terminology that Microsoft uses to describe software updates.
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문서 ID: 3083729 - 마지막 검토: 2015. 9. 15. - 수정: 1

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