Messages in this thread | | | Date | Sun, 6 Apr 2008 09:37:31 -0700 (PDT) | From | dean gaudet <> | Subject | Re: How does Linux measure CPU frequency? |
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linux knows what style of cpu it is running on and uses non-portable techniques to read the time-stamp counter.
lmbench uses some really nice tricks to estimate the cpu frequency in a portable manner... all it requires is that at least two of the N code sequences it times take a co-prime number of cycles.
-dean
On Sun, 6 Apr 2008, Jack Harvard wrote:
> Hi, > > I want to find out how Linux calibrates the frequency of CPUs, and > want to compare with the way how lmbench measures processor frequency. > I had a thorough google search of this topic but didn't get too much > useful results. > > Thanks a lot, > Jack > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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