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on 07/12/2007 01:17 PM Bernhard Auzinger wrote the following: |
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>>>> bogomips : 3611.22 |
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>>>> TLB size : 1024 4K pages |
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>>>> |
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>>>> bogomips : 1603.39 |
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>>>> TLB size : 1024 4K pages |
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>>>> |
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>>>> 2) Just curious: Why is there such a big difference between the 2 CPUs' |
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>>>> bogomips values reported? |
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>>>> -- |
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>>>> gentoo-amd64@g.o mailing list |
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>> -- |
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>> Piotr |
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> |
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> There has to be no difference between the two cores on dual-core processors. |
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> That's because the bogomips-benchmark is a "calculated" benchmark that |
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> depends mostly on the clock frequency and since the two cores on dual-core |
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> athlons/opterons use the same clock, it's not possible to have different |
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> values on that type of dual-core processor. I've absolutely identical values |
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> (4825.77 bogomips) for both cores of my Athlon64 X2 4600+. |
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> |
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> If you have two processors (f.ex. two single-cores) on your mainboard, than |
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> you will have two slightly different values because of the slightly different |
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> clock of the two processors. In your case it seems that the second processor |
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> has a decreased clock. I'm sure you have enabled cool'n'quiet. |
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> |
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> Rgds |
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|
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Actually I had never changed the CPUs freq/governor states, and they |
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were set to 800MHz/userspace. |
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After I changed their state using gnome applet, and from then on, the |
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two CPUs' bogomips values where equal. |
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For governor set to performance here they are: |
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#cat /proc/cpuinfo |grep -E 'proc|MHz|bogomips' |
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processor : 0 |
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cpu MHz : 1800.000 |
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bogomips : 8125.24 |
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processor : 1 |
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cpu MHz : 1800.000 |
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bogomips : 8125.24 |
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|
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However, if I boot into M$ windblows (dual boot system), then boot into |
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linux without touching the CPUs' freq/gov state the MHz/bogomips values |
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are changed back to: |
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processor : 0 |
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cpu MHz : 800.000 |
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bogomips : 3611.94 |
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processor : 1 |
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cpu MHz : 800.000 |
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bogomips : 1603.39 |
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|
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The 800 MHz is because I have compiled with |
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CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y |
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CONFIG_CPU_FREQ_GOV_USERSPACE=y |
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|
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|
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-- |
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