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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:

DownloadDownload 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

The global version of this update 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 Server 2012 R2 file information and 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:
    VersionProductMilestoneService branch
    6.3.960 0.17xxxWindows Server 2012 R2RTMGDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes aren't listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Wdstftp.dll6.3.9600.17995477,18424-Jul-201517:51x64
Wdstftpctr.hNot applicable88018-Jun-201315:08Not applicable
Wdstftpctr.iniNot applicable3,84418-Jun-201315:08Not applicable

Additional file information

Additional file information for Windows Server 2012 R2
Additional files for all supported x64-based versions of Windows Server 2012 R2
File propertyValue
File nameAmd64_b58e35238ea67f1df0e72f1dd431434e_31bf3856ad364e35_6.3.9600.17998_none_7efc9ecc04cbaf1f.manifest
File versionNot applicable
File size723
Date (UTC)29-Jul-2015
Time (UTC)20:52
PlatformNot applicable
File nameAmd64_microsoft-windows-d..ervices-tftp-server_31bf3856ad364e35_6.3.9600.17998_none_06da453507e7acef.manifest
File versionNot applicable
File size14,483
Date (UTC)28-Jul-2015
Time (UTC)16:50
PlatformNot applicable
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.
Properties

Article ID: 3083729 - Last Review: 09/15/2015 17:09:00 - Revision: 1.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation

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