IntroductionA hotfix is available that improves the performance of common language runtime (CLR) when a .NET Framework 3.5 Service Pack 1 (SP1)-based application runs in a virtualized environment. This hotfix reduces high CPU utilization of the hypervisor in a virtualized environment. For example, the hypervisor overhead is reduced by about 5% in Windows Azure after you apply this hotfix. RESOLUTIONHotfix informationA supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may 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. To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. PrerequisitesYou must have the .NET Framework 2.0 Service Pack 2 (SP2) or the .NET Framework 3.5 SP1 installed to apply this hotfix.Restart requirementYou do not have to restart the computer after you apply the hotfix if the affected files are not being used. Hotfix replacement informationThis hotfix does not replace any other hotfixes.File informationThe English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. 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. Read more: KB Alertz
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. PrerequisitesYou must have the .NET Framework 2.0 Service Pack 2 (SP2) or the .NET Framework 3.5 SP1 installed to apply this hotfix.Restart requirementYou do not have to restart the computer after you apply the hotfix if the affected files are not being used. Hotfix replacement informationThis hotfix does not replace any other hotfixes.File informationThe English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. 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. Read more: KB Alertz
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