Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp

[Peter Zijlstra]

On Tue, Dec 08, 2015 at 09:50:26AM +0100, Peter Zijlstra wrote:
> On Tue, Dec 08, 2015 at 06:36:04AM +0100, Ingo Molnar wrote:
> 
> > So I checked my NHM box with your latest queue and it now works correctly. Do you 
> > have any idea what the difference is/was?
> 
> Sadly, no clue :/
> 
> I went over those patches and cannot find anything that should affect
> NHM (or <=SNB in fact).

Oh wait, I spoke too soon, the two new patches affect everything with
PEBS. And esp. the latter one:

  lkml.kernel.org/r/1449177740-5422-2-git-send-email-andi@xxxxxxxxxxxxxx

But note that this is a pre-existing issue and should not be changed
by the skl-:pp and :ppp patches.


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