Messages in this thread | | | Date | Wed, 5 Feb 2014 20:55:06 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6 |
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On Wed, Feb 05, 2014 at 02:37:29PM -0500, Vince Weaver wrote: > 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.
The doc said 0xB1, right? Should we keep it at that? Its not like there's a lot of PPro machines left out there, so better safe than sorry.
> It also disables rdpmc on original Pentiums due to errata 74 but I don't > think we have to worry about that one.
We don't have a Family 5 driver, so no.
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