Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6

[Vince Weaver]

On Wed, 5 Feb 2014, Vince Weaver wrote:

> Has someone actually hit this bug?  People used PAPI/perfctr on these 
> machines for years, and it uses rdpmc by default so I would think it would 
> show up if it were an issue.  I should check the perfctr code to see if it 
> had some sort of check.

I can verify the perfctr code does have a case for PPRO errata 26, but it 
only disables things on pentium pros with stepping less than 9.

It also disables rdpmc on original Pentiums due to errata 74 but I don't 
think we have to worry about that one.

Vince
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