Fix for Hyper threading in WinXP SP1
SYMPTOMSA program that uses large mapped file views to share information between two processes
may experience a significant performance decrease. The performance degradation
occurs in the UnmapViewOfFile function. CAUSE
This problem occurs if you install Windows XP Service Pack 1 (SP1) on an Intel
Pentium 4 computer that has more than one logical processor. RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to
correct the problem that is described in this article. Apply it only to computers
that are experiencing this specific problem. This fix may receive additional
testing. Therefore, if you are not severely affected by this problem, Microsoft
recommends that you wait for the next Windows XP service pack that contains
this fix.
To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, visit the following Microsoft
Web site:
Download
the fix Q815227 Hyper-Threading Update
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