linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Message-ID: <4FD89D09.6010800@zytor.com>
Date:	Wed, 13 Jun 2012 07:00:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <bp@...64.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, andi@...stfloor.org, mingo@...e.hu,
	ming.m.lin@...el.com, "Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

On 06/13/2012 01:38 AM, Peter Zijlstra wrote:
> On Tue, 2012-06-12 at 13:58 -0700, H. Peter Anvin wrote:
>>  even things like Nehalem + Westmere in the same system
> 
> Uhm,.. how well do you expect Linux to run on a franken-system like
> that? I'm pretty sure perf will malfunction in such a setup.
> 

perf might, but I have seen such frankensystems in the field and they
work (although I haven't seen that particular combo, I have to admit.)

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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