Q. Your Windows Server 2003 System event log reports many 'PerfOS event ID: 2001 - Unable to get interrupt information from system' errors?

When your Windows Server 2003 has more than 32 processors, the System event log reports many:

PerfOS event ID: 2001 - "Unable to get interrupt information from system."

This behavior will occur if any 32-bit application uses the NtQuerySystemInformation function to determine the number of available processors. Because there are more than 32 processors available, the PerOS event is logged each time that the NtQuerySystemInformation function is used.

This behavior has been corrected and will be available in Windows Server 2003 SP2 (Service SP2ack 2), by setting the LogErrorToFile Value Name to 0:

1. Open a CMD.exe window.

2. Type the following command and press Enter:

reg add HKLMSYSTEMCurrentControlSetServicesPerfOSPerformance /V LogErrorToFile /T REG_DWORD /F /D 0