1 Reply Latest reply: Dec 7, 2011 10:34 AM by Adolfo_Intel RSS

MSR_PKG_RAPL_PERF_STATUS availability?

barry_rountree Community Member
Currently Being Moderated

I'm writing a driver for the RAPL MSRs and have come across the following in the documentation:

 

"MSR_PKG_RAPL_PERF_STATUS can report performance impact of power limiting, but its availability may be model-specific."

[pg 14-30, v3B, Oct. 2011]

 

 

1)  This is listed as MSR_PKG_PERF_STATUS in table 34-10 [pg 34-158 v3C Oct. 2011].  Please fix.

 

2)  I'm getting an I/O error when trying to read this MSR (0x613).  The rest of the PKG MSRs are fine, so I'm guessing this is confirmation that MSR_PKG_PERF_STATUS isn't available on my dev machine [family=6, model=42, stepping=7].

 

3)  I'm targetting this driver for the Xeon version of Sandy Bridge.  I think I heard that we're getting the C revision.  Will it be available there?  Does anyone have a chart showing which steppings have this enabled?

 

RTFM is a welcome answer so long as a pointer is given to which FM I should R.

 

Thanks,

 

Barry Rountree

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