Messages in this thread | | | Date | Wed, 1 Aug 2007 10:52:23 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 2/7] Simple Performance Counters: x86_64 support |
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On Wed, 1 Aug 2007, Andi Kleen wrote:
> Christoph Lameter <clameter@sgi.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.
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