[data from a 1.2 GHz VIA C3 (Nehemiah)]

PERFCTR INIT: vendor 5, family 6, model 9, stepping 8, clock 1199925 kHz
PERFCTR INIT: NITER == 64
PERFCTR INIT: loop overhead is 272 cycles
PERFCTR INIT: rdtsc cost is 24.2 cycles (1822 total)
PERFCTR INIT: rdpmc cost is 18.9 cycles (1486 total)
PERFCTR INIT: rdmsr (counter) cost is 31.0 cycles (2260 total)
PERFCTR INIT: rdmsr (evntsel) cost is 62.7 cycles (4289 total)
PERFCTR INIT: wrmsr (counter) cost is 46.8 cycles (3271 total)
PERFCTR INIT: wrmsr (evntsel) cost is 73.8 cycles (4999 total)
PERFCTR INIT: read cr4 cost is 27.5 cycles (2038 total)
PERFCTR INIT: write cr4 cost is 169.7 cycles (11137 total)
PERFCTR INIT: sync_core cost is 157.7 cycles (10367 total)
perfctr: driver 2.7.5, cpu type VIA C3 at 1199925 kHz