[data from a 2.2GHz Athlon64]

PERFCTR INIT: vendor 2, family 15, model 4, stepping 10, clock 2200035 kHz
PERFCTR INIT: NITER == 64
PERFCTR INIT: loop overhead is 627 cycles
PERFCTR INIT: rdtsc cost is 6710885.6 cycles (581 total)
PERFCTR INIT: rdpmc cost is 6710886.2 cycles (615 total)
PERFCTR INIT: rdmsr (counter) cost is 42.3 cycles (3340 total)
PERFCTR INIT: rdmsr (evntsel) cost is 48.0 cycles (3700 total)
PERFCTR INIT: wrmsr (counter) cost is 64.2 cycles (4739 total)
PERFCTR INIT: wrmsr (evntsel) cost is 319.8 cycles (21098 total)
PERFCTR INIT: read cr4 cost is 6710883.8 cycles (461 total)
PERFCTR INIT: write cr4 cost is 59.3 cycles (4424 total)
PERFCTR INIT: write LVTPC cost is 2.5 cycles (792 total)
perfctr: driver 2.7.3, cpu type AMD K7/K8 at 2200035 kHz
