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Subject: [OT] Windows XP SP2 Multi Core Processors Performance Hotfix

Author: Frank Mueller

Date: 04:30:26 10/12/05


Microsoft has just released a hotfix addressing a possible decrease in
performance on dual-core machines.

http://support.microsoft.com/kb/896256/en-us

"This hotfix also addresses the following issues on computers that have
multiple processors that support processor performance states:

• A possible decrease in performance on single-threaded workloads when
  processor performance states are using demand-based switching.

• The synchronization of the processor Time Stamp Counter (TSC) registers
  across processors when you use the ACPI Power Management timer on
  multiprocessor systems.

• ACPI C-state promotion and demotion issues in the kernel power manager."

This hotfix is not directly available via download center. To obtain the hotfix,
you have to contact Microsoft Product Support Services.

Best regards,

Frank



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