Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 25 Nov 2010 22:10:02 +0100 | Subject | Re: [RFC PATCH 2/3 v2] perf: Implement Nehalem uncore pmu | From | Stephane Eranian <> |
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On Thu, Nov 25, 2010 at 7:20 PM, Andi Kleen <andi@firstfloor.org> wrote: >> Yep, I see no reason to dis-allow sampling. Sure its hard to make sense >> of it, but since there are people who offline all but one cpu of a >> package, > > Assuming they don't have any active PCI devices either. > Good point.
>> I bet there are people who will run just one task on a package >> as well. > > In that case the sampling has a 1/NUM-CPU-THREADS-IN-PACKAGE chance > to report the right task (or actually somewhat less because the measurement > skew for uncore is much higher than for normal events) > > Really for per core measurements using the OFFCORE events is much better. > yes, OFFCORE_RESPONSE is much more useful.
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