Messages in this thread | | | Date | Tue, 14 Nov 2006 13:28:04 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [PATCH 0/2] Make the TSC safe to be used by gettimeofday(). |
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On Mon, 13 Nov 2006, Suleiman Souhlal wrote:
> I believe that the results returned will always be monotonic, as long as the > frequency of the TSC does not change from under us (that is, without the > kernel knowing). This is because we "synchronize" each CPU's vxtime with a > global time source (HPET) every time we know the TSC rate changes.
TSC frequencies of different clocks coming with multiple processors may vary which creates a differential even if they are initially synchronized. - 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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