Blame src/perfctr-2.7.x/etc/costs/K6-III-400

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[data from a 400MHz K6-III]
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PERFCTR INIT: vendor 2, family 5, model 9, stepping 1, clock 399815 kHz
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PERFCTR INIT: NITER == 64
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PERFCTR INIT: loop overhead is 64 cycles
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PERFCTR INIT: rdtsc cost is 15.4 cycles (1055 total)
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PERFCTR INIT: read cr4 cost is 24.4 cycles (1629 total)
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PERFCTR INIT: write cr4 cost is 36.3 cycles (2393 total)
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perfctr: driver 2.3.3, cpu type Generic x86 with TSC at 399815 kHz