On Wed, 5 Feb 2014, Peter Zijlstra wrote: > On Wed, Feb 05, 2014 at 02:16:43PM -0500, Vince Weaver wrote: > > On Wed, 5 Feb 2014, Peter Zijlstra wrote: > > > > > P6 class machines can die hard when PCE gets enabled due to CPU > > > errata. The safe way it so disable it by default and keep it disabled. > > > > > > See errata 26: > > > > so you take an errata applicable to a subset of Pentium Pro steppings and > > apply it to the whole p6 line (which includes the whole way up to Pentium > > III)? > > > > Or am I missing something in the documentation you link to? > > I forgot it went all the way to P-III, let me try and find the other > erratas.
from the document you linked it looks like it was fixed by the Pentium Pro stepping sB1 (6.1.9). 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. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
