Hallo,
on the new core duo cpus the frequency measurement only measures a constant frequency, although speedstep changes the frequency via multiplier.
int i,tdiff;
DWORD_PTR oldaff=NULL;
unsigned _int64 rtanfang,rt1,rt2;
LARGE_INTEGER t1,t2,tanfang,freq;
timeb zeitanfang,zeitende;
ftime(&zeitanfang);
rtanfang=__rdtsc();
Sleep (500);
ftime(&zeitende);
rt1 = __rdtsc();
time_t rdif;
time_t rdif1;
rdif = zeitende.time-zeitanfang.time;
rdif1 = zeitende.millitm-zeitanfang.millitm + rdif * 1000;
int rcy = (int)(rt1-rtanfang);
*frequenz = (
int)(rcy / rdif1 / 100);
There is no change if you takeQueryPerformanceCounter for better accuracy. Any idea to get cpu frequency dependent values with core duo chips?
