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Date: Wed, 1 Aug 2007 10:52:23 -0700 (PDT) From: Christoph Lameter <clameter@....com> To: Andi Kleen <andi@...stfloor.org> cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/7] Simple Performance Counters: x86_64 support On Wed, 1 Aug 2007, Andi Kleen wrote: > Christoph Lameter <clameter@....com> writes: > > > Export cycles_to_ns (after renaming the cycles_2_ns to cycles_to_ns to be > > conforming to other arches). > > This function is broken in some cases (e.g Opteron with powernow or > AMD dual core or older Intel systems) and going away. The TSCs tick > with different frequencies on different CPU there. In general i would > recommend to only report cycles. But then the numbers are not comparable across systems. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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