[data from a 933MHz Pentium III (Coppermine)]

PERFCTR INIT: vendor 0, family 6, model 8, stepping 10, clock 930391 kHz
PERFCTR INIT: NITER == 64
PERFCTR INIT: loop overhead is 103 cycles
PERFCTR INIT: rdtsc cost is 35.8 cycles (2396 total)
PERFCTR INIT: rdpmc cost is 35.4 cycles (2369 total)
PERFCTR INIT: rdmsr (counter) cost is 91.2 cycles (5943 total)
PERFCTR INIT: rdmsr (evntsel) cost is 72.7 cycles (4758 total)
PERFCTR INIT: wrmsr (counter) cost is 80.5 cycles (5261 total)
PERFCTR INIT: wrmsr (evntsel) cost is 75.9 cycles (4963 total)
PERFCTR INIT: read cr4 cost is 1.7 cycles (215 total)
PERFCTR INIT: write cr4 cost is 42.0 cycles (2796 total)
PERFCTR INIT: write LVTPC cost is 40.2 cycles (2679 total)
perfctr: driver 2.7.3, cpu type Intel P6 at 930391 kHz

PERFCTR INIT: vendor 0, family 6, model 8, stepping 3, clock 933389 kHz
PERFCTR INIT: NITER == 64
PERFCTR INIT: loop overhead is 102 cycles
PERFCTR INIT: rdtsc cost is 32.1 cycles (2162 total)
PERFCTR INIT: rdpmc cost is 34.8 cycles (2331 total)
PERFCTR INIT: rdmsr (counter) cost is 91.2 cycles (5943 total)
PERFCTR INIT: rdmsr (evntsel) cost is 72.7 cycles (4755 total)
PERFCTR INIT: wrmsr (counter) cost is 80.5 cycles (5258 total)
PERFCTR INIT: wrmsr (evntsel) cost is 75.7 cycles (4953 total)
PERFCTR INIT: read %cr4 cost is 1.7 cycles (217 total)
PERFCTR INIT: write %cr4 cost is 42.0 cycles (2795 total)
perfctr: driver 2.1, cpu type Intel Pentium III at 933389 kHz