[data from a 1.0 GHz Athlon]

PERFCTR INIT: vendor 2, family 6, model 4
PERFCTR INIT: NITER == 64
PERFCTR INIT: rdpmc ticks == 1679
PERFCTR INIT: rdmsr (counter) ticks == 3399
PERFCTR INIT: rdmsr (evntsel) ticks == 3453
PERFCTR INIT: wrmsr (counter) ticks == 5893
PERFCTR INIT: wrmsr (evntsel) ticks == 14955
PERFCTR INIT: read %cr4 ticks == 219
PERFCTR INIT: write %cr4 ticks == 4129
PERFCTR INIT: loop overhead ticks == 83
PERFCTR INIT: Athlon test0 == 0 (ok)
PERFCTR INIT: Athlon test1 == 35 (ok)
PERFCTR INIT: Athlon test2 == 35 (EvntSel0 does not override)
PERFCTR INIT: Athlon test3 == 0 (ok)