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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Discrepancies between /proc/cpuinfo and Dave J's x86info
Date: 10 Jul 2001 21:44:42 -0700
Organization: Transmeta Corporation, Santa Clara CA
Message-ID: <9igljq$nlu$1@cesium.transmeta.com>
In-Reply-To: <3B4BC5C0.BDDC12A6@home.com> <9igkjl$nk1$1@cesium.transmeta.com> <p05100358b771879535bc@[207.213.214.37]>
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Copyright: Copyright 2001 H. Peter Anvin - All Rights Reserved
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Followup to:  <p05100358b771879535bc@[207.213.214.37]>
By author:    Jonathan Lundell <jlundell@pobox.com>
In newsgroup: linux.dev.kernel
>
> At 9:27 PM -0700 2001-07-10, H. Peter Anvin wrote:
> >  > According to Dave J's utility the cpu's appear to be exactly the same
> >>  just as the Intel boxes said when I bought them.  What might be causing
> >>  these values to be different.  And if the BIOS is setting things up
> >>  incorrectly then why does Dave J's utility show the correct values?
> >>  Thanks for any help.
> >>
> >
> >/proc/cpuinfo shows "cooked" values which may be modified by the
> >kernel, depending on what it knows about CPU errata or kernel
> >capabilities.
> 
> Max cpuid level doesn't get cooked by the kernel, though  (at least 
> not in 2.4.6).
> 
> Level 3 is the Intel's CPU serial number "feature". Didn't Intel back 
> off on that? Maybe that has something to do with it, and perhaps the 
> utility is doing the cooking.
> 

Actually, the kernel kills it if it detects it.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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