linux-kernel - Re: [PATCH 3/5] perf, x86: Disable PEBS on clowertown chips

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Message-ID: <bd4cb8901003051128l67a52d38h17208ec340b86c4e@mail.gmail.com>
Date:	Fri, 5 Mar 2010 11:28:36 -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 11:15 AM, Peter Zijlstra <peterz@...radead.org> 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.
>
There is erratum which you need to implement the workaround for and
this is AAJ91 on Nehalem. It does happen.
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