On Wed, 5 Feb 2014, Peter Zijlstra wrote: > 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.
mfg steping "sB1" which means processor stepping 9. See page 15 of the document linked in the original patch. I used to have a Pentium Pro that was apparently affected by this erratum but not any more. The oldest machine I test perf stuff on is a Pentium II. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
