Article ID: 908369
Article Last Modified on 11/1/2006
APPLIES TO
- Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
- Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
- Microsoft Windows Server 2003, Standard Edition (32-bit x86)
- Microsoft Windows Server 2003, Web Edition
- Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
- Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
SYMPTOMS
When a processor on a Microsoft Windows Server 2003-based computer resumes from a C1 idle state, the computer may stop responding. Additionally, you may experience one or more of the following symptoms:
- The computer automatically restarts.
- After you log on, you receive the following error message:
If the error message still appears and if you want to see the data that the error report contains, click the Click here link at the bottom of the message box. You then see error-signature information that is similar to the following:
BCCode : 0000000A BCP1 : 0f6ff8c0 BCP2 : 000000ff BCP3 : 00000000 BCP4 : 8074867e OSVer : 5_2_3718 SP : 0_0 Product : 272_3
- You receive the following "Stop" error message on a blue screen:
- An error message that is similar to the following is logged in the System event log:
Notes
- The symptoms of a "Stop" error vary according to the computer's system failure options. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
307973 How to configure system failure and recovery options in Windows
- The four parameters that are included in the error signature information vary according to the computer's configuration.
- Not all "Stop 0x0000000A" errors are caused by the problem that this article describes.
CAUSE
This problem occurs because of a processor bug in some CPUs.
Instruction bytes are read into the instruction cache in fixed-size blocks (cache lines). When the bytes that make up an instruction cross a cache line boundary, the instruction bytes occupy multiple adjacent cache lines. If a certain specific processor error occurs, the processor may read in the second part of the instruction from the wrong cache line for execution. This behavior causes an incorrect instruction.
The Ntkrnlmp.exe file that is included in hotfix 840987 includes a sequence of instructions that reveal this bug.
Note This problem occurs only when the processor is handling an interprocessor interrupt (IPI) that causes the processor to resume from the C1 idle state.
WORKAROUND
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To work around this problem, prevent the processor from entering the C1 idle state. To do this, follow these steps:
- Start Registry Editor. To do this, click Start, click Run, type regedt32, and then click OK.
- Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlset\Control\Session Manager\Power
- Click Edit, point to New, click DWORD Value, and then type IdleFrom0IdlePercent.
- Right-click IdleFrom0IdlePercent, and then click Modify. In the Edit DWORD Value dialog box, type a number that is more than 100 in the Value data box, click Decimal under Base, and then click OK.
Note The following two registry subkeys control when Windows causes the processor to enter a C1 idle state:
HKEY_LOCAL_MACHINE\System\CurrentControlset\Control\Session Manager\Power\IdleFrom0DelayHKEY_LOCAL_MACHINE\System\CurrentControlset\Control\Session Manager\Power\IdleFrom0IdlePercent
For example, assume that you have set the IdleFrom0IdlePercent value to 10 and the IdleFrom0Delay value to 5. In this case, the system must be 10 percent idle over a period of 5 micrososeconds before the CPU enters the C1 idle state. Therefore, if you set the IdleFrom0IdlePercent value to a number that is more than 100, the CPU will never enter the C1 idle state.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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