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.
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.
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.
To install this update, you don't have to make any changes to the registry.
You may have to restart the computer after you apply this update.
Update replacement information
This update doesn't replace a previously released update.
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:
Windows Server 2012 R2
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
Additional file information
Additional file information for Windows Server 2012 R2
Additional files for all supported x64-based versions of Windows Server 2012 R2