On Fri, 9 Jul 2010, Ankush Gupta wrote:
> Hi,
>
>
> I am interested in measuring per-core remote read memory bandwidth on an
> Intel Nehalem machine
> using libpfm4.
>
> I think the only way to do it is using the OFFCORE_RESPONSE_0 event. Looking
> at the source
> code of libpfm4: intel_nhm_events.h, the event is commented out. The
> encoder for the function
> pfm_nhm_offcore_encode in file ./pfmlib_intel_nhm.c has also been commented
> out. Seems it is
> not supported yet.
>
> Is this a limitation of libpfm4 or perf_events?
>From what I understand, using OFFCORE_RESPONSE requires access to an
additional processor MSR (one not used by other counters) and that
perf_events currently does not support this.
Vince
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