Blame src/perfctr-2.7.x/etc/costs/Duron-750
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[data from a 750MHz Duron]
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PERFCTR INIT: vendor 2, family 6, model 3
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PERFCTR INIT: NITER == 64
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PERFCTR INIT: loop overhead is 88 cycles
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PERFCTR INIT: rdtsc cost is 11.2 cycles (805 total)
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PERFCTR INIT: rdpmc cost is 12.9 cycles (918 total)
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PERFCTR INIT: rdmsr (counter) cost is 51.7 cycles (3400 total)
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PERFCTR INIT: rdmsr (evntsel) cost is 52.7 cycles (3465 total)
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PERFCTR INIT: wrmsr (counter) cost is 81.6 cycles (5314 total)
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PERFCTR INIT: wrmsr (evntsel) cost is 231.6 cycles (14913 total)
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PERFCTR INIT: read %cr4 cost is 4.7 cycles (390 total)
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PERFCTR INIT: write %cr4 cost is 62.9 cycles (4119 total)
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perfctr: driver 2.0-pre3, cpu type AMD K7 at 749671 kHz
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