On Fri, 25 Jun 2010, Troeger, Peter wrote:
> 
> What can I do to debug this situation ? Is there a possibility to enforce a 
> particular PMU model, for example by direct usage of the library ? 

out of curiosity, can you send your /proc/cpuinfo file?  The important 
info is the family/model/stepping info.  Until recently the various perf 
counter implementations had slightly different support for the various 
Nehalem EX models and one of them might have fallen through the cracks.

Vince


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