[data from a 233 MHz Cyrix MII]

PERFCTR INIT: vendor 1, family 6, model 2, stepping 8, clock 232620 kHz
PERFCTR INIT: NITER == 64
PERFCTR INIT: loop overhead is 253 cycles
PERFCTR INIT: rdtsc cost is 12.4 cycles (1051 total)
PERFCTR INIT: rdpmc cost is 13.4 cycles (1111 total)
PERFCTR INIT: rdmsr (counter) cost is 20.3 cycles (1554 total)
PERFCTR INIT: rdmsr (evntsel) cost is 19.6 cycles (1512 total)
PERFCTR INIT: wrmsr (counter) cost is 16.9 cycles (1335 total)
PERFCTR INIT: wrmsr (evntsel) cost is 16.4 cycles (1307 total)
PERFCTR INIT: read cr4 cost is 5.6 cycles (616 total)
PERFCTR INIT: write cr4 cost is 21.3 cycles (1619 total)
PERFCTR INIT: sync_core cost is 93.4 cycles (6232 total)
perfctr: driver 2.7.5, cpu type Cyrix 6x86MX/MII/III at 232620 kHz