On 5/15/06, Peter Dimov <pdimov@mmltd.net> wrote:
Silex wrote:
The problem with QueryPerformanceCounter is that QueryPerformanceFrequency is not (AFAIK) required to return the same value every time. It may be CPU clock based, and a low power CPU can vary its frequency depending on load.
No, "the frequency cannot change while the system is running." (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui...)
You are right, a variable frequency is explicitly disallowed in the documentation now. Most chipset bugs that affected QPC also don't seem to be an issue nowadays.
Does anyone know if the issue mentioned in this KB article is still relevant? http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q274323& --Michael Fawcett