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High rate of SMIs may cause a Hyper-V enabled system to hang at boot on Windows Server 2008 R2Article ID: 2722461 - View products that this article applies to. SYMPTOMSConsider the following scenario: You have a Windows Server 2008 R2 system with the Hyper-V role enabled. If the BIOS has been set to inject SMIs at a high rate, 11 SMI/sec for example. The system may hang during boot time. Failure can also occur at lower frequencies (system hanging/slower boot time), but as the rate of SMI injections increases, the likelihood of failure (system hanging) increases. CAUSEIf an SMI occurs before all processors are ready to receive SMIs, Windows boot will hang. RESOLUTIONReduce the rate of SMI injection in the BIOs to prevent a hang during Windows boot. MORE INFORMATIONProduction servers typically do not include BIOS setting for manually injecting SMIs. These setting would only be available in an OEM or BIOS vendor's testing environment. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use
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