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

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Message-ID: <alpine.DEB.2.02.1402051435540.16859@pianoman.cluster.toy>
Date:	Wed, 5 Feb 2014 14:37:29 -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, 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.

It also disables rdpmc on original Pentiums due to errata 74 but I don't 
think we have to worry about that one.

Vince
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