CPU usage at 100% when you move files in Windows Server 2008

Applies to: Windows Server 2008 Service Pack 2Windows Server 2008 DatacenterWindows Server 2008 Enterprise More

Symptoms


After installing security update 4041995 or any other recent update that includes srv2.sys, CPU usage may spike up to 100% when you perform any type of SMB activity, such as copying files over the network. The problem is especially likely to occur if the computer only has a single-core CPU.

More Information


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.

How to obtain and install the update


Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Windows Server 2008 file information


The English (United States) version of this software 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.

Additional file information