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Date: Fri, 5 Mar 2010 13:22:06 -0800 From: Stephane Eranian <eranian@...gle.com> To: Peter Zijlstra <peterz@...radead.org> Cc: mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org, robert.richter@....com, fweisbec@...il.com, Arnaldo Carvalho de Melo <acme@...radead.org> Subject: Re: [PATCH 3/5] perf, x86: Disable PEBS on clowertown chips On Fri, Mar 5, 2010 at 1:05 PM, Peter Zijlstra <peterz@...radead.org> wrote: > On Fri, 2010-03-05 at 20:15 +0100, Peter Zijlstra wrote: >> On Fri, 2010-03-05 at 10:58 -0800, Stephane Eranian wrote: >> > > case 15: /* original 65 nm celeron/pentium/core2/xeon, "Merom"/"Conroe" */ >> > > + x86_pmu.quirks = intel_clowertown_quirks; >> > >> > That's too coarse grain! >> > It is more subtle than this. Some of the errata are marked as Plan >> > fix. They seem to be >> > fixed in later models. Your looking at the E5xxx series errata but the >> > E7xxx do not have >> > the same problems. >> >> OK, I'll look at those errata again and try to come up with a stepping >> test for this errata. > > The two serious ones, AJ106 and AJ68 are no fix and are listed as such > in all errata I can find, including the 7[23]00 series. > Not E74xx. I think it would be fine to drop LBR with PEBS as the work-around to AJ106. > I checked the 65nm Core2Duo, Xeon 5200 and Xeon 7[23]00 spec updates. > Going by that it seems the full model 15 family is broken and I'll leave > the patch as is. But the E74xx are okay and you are excluding them. Worst case you should provide an override. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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