linux-kernel - Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6

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Message-ID: <alpine.DEB.2.02.1402051415190.16225@pianoman.cluster.toy>
Date:	Wed, 5 Feb 2014 14:16:43 -0500 (EST)
From:	Vince Weaver <vince@...ter.net>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	junk@...af.co.uk, alan@...rguk.ukuu.org.uk,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6

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?

Vince
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