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The system clock may run fast when you use the ACPI power management timer as a high-resolution counter on Windows 2000-based, Windows XP-based, and Windows Server 2003-based computers

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

SYMPTOMS
When a Microsoft Windows 2000-based, Windows XP-based, or Windows Server 2003-based computer runs in Advanced Configuration and Power Interface (ACPI) mode and uses a high-resolution counter, the system clock may run fast.
CAUSE
This issue may occur if the time increment in a program changes and the Hardware Abstraction Layer (HAL) cannot measure the time interval between successive clock interrupts. This causes the system clock to lose a short period of time. When the HAL misses many time-interval measurements in quick succession, the time loss may be significant.

Note
  • This issue may occur on a computer that is running Halaacpi.dll (UP, ACPI, or APIC), Halmacpi.dll (MP, ACPI, or APIC), and Halmps.dll (MP, non-ACPI, or legacy) because these DLLs use the Real Time Clock (RTC) to generate clock interrupts.
  • This issue does not occur on a computer that is running Halacpi.dll (UP, ACPI, or PIC) or Halx86.dll (UP, non-ACPI, or legacy) because these DLLs use the 8254 Programmable Interval Timer (PIT) to generate clock interrupts.
WORKAROUND
To work around this issue, use one of the following methods:
  • Modify the program to call the timeBeginPeriod function at startup and to call the timeEndPeriod function on exit. This workaround eliminates repeated time increment changes.
  • Modify the program to use the QueryPerformanceCounter() API.
acpi timer time delay system clock fast pmtimer timebeginperiod timeendperiod queryperformancecounter
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Article ID: 821893 - Last Review: 01/07/2009 17:19:50 - Revision: 5.0

Microsoft Windows Server 2003, Standard Edition (32-bit x86), Microsoft Windows Server 2003, Enterprise Edition (32-bit x86), Microsoft Windows XP Home Edition, Microsoft Windows XP Professional, Microsoft Windows 2000 Server, Microsoft Windows 2000 Advanced Server, Microsoft Windows 2000 Professional Edition

  • kbnofix kbprb KB821893
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