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

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Message-ID: <18460.50662.535054.982353@harpo.it.uu.se>
Date:	Sat, 3 May 2008 22:07:02 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	hadi@...erus.ca, Thomas Gleixner <tglx@...utronix.de>,
	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...

H. Peter Anvin writes:
 > jamal wrote:
 > > 
 > > Indeed it does - thanks.
 > > 
 > >> Please provide
 > >> also output of /proc/cpuinfo.
 > > 
 > > mambo:~# cat /proc/cpuinfo
 > > processor       : 0
 > > vendor_id       : GenuineIntel
 > > cpu family      : 6
 > > model           : 3
 > > model name      : Pentium II (Klamath)
 > > stepping        : 3
 > > cpu MHz         : 1063.771
 > > cache size      : 128 KB
 > > fdiv_bug        : no
 > > hlt_bug         : no
 > > f00f_bug        : no
 > > coma_bug        : no
 > > fpu             : yes
 > > fpu_exception   : yes
 > > cpuid level     : 2
 > > wp              : yes
 > > flags           : fpu de pse tsc msr pae mce cx8 sep pge cmov mmx fxsr
 > > sse sse2
 > > bogomips        : 2160.92
 > > clflush size    : 32
 > > power management:
 > > 
 > 
 > This is very odd.
 > 
 > Could you try running the attached C program on this processor and 
 > report the result?  (Binary included for convenience.)
 > 
 > Arjan: this seems to directly contradict the Intel documentation.  Do 
 > you have any way to find out what the deal is with this?

hpa's p6nops test program works fine here on both a PII (family 6 model 3)
and a Pentium Pro (family 6 model 1 stepping 9).

I'm noticing another anomaly in jamal's /proc/cpuinfo above: since when
can a PII have sse and sse2? As far as I recall, it was the PIII that
added sse, and sse2 came with the P4.

/Mikael
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