linux-kernel - Re: i387/FPU init issues...

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Message-ID: <18460.46554.826031.184323@harpo.it.uu.se>
Date:	Sat, 3 May 2008 20:58:34 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, jamal <hadi@...erus.ca>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: i387/FPU init issues...

Thomas Gleixner writes:
 > On Sat, 3 May 2008, H. Peter Anvin wrote:
 > 
 > > Thomas Gleixner wrote:
 > > > 
 > > > Jan, are you sure that P3 knows the P6 NOPs ? AFAICT its P4, but I
 > > > have to dig up the manuals.
 > > > 
 > > 
 > > Pentium III is the P6 core, so it will.
 > > 
 > > Intel explicitly documents "all processors with family 6 or F."
 > 
 > Yeah, I looked up myself and noticed that I confused those stupid
 > numbers again.
 > 
 > Nevertheless reality seems to tell a different story :)

I've tested the "0f 1f 00" 3-byte NOP on two PIIs,
a Klamath (family 6 model 3 stepping 4) and a Deschutes
(family 6 model 5 stepping 0), and it worked fine on both.

Are you absolutely sure it's this 3-byte NOP that oopses?

I also noticed that jamal's /proc/cpuinfo contains
> cpu MHz         : 1063.771
which is either wrong or indicates serious overclocking.
The PIIs maxed out at about 400/450MHz.

/Mikael
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