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

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Message-ID: <481CB384.2070704@zytor.com>
Date:	Sat, 03 May 2008 11:48:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	hadi@...erus.ca
CC:	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...

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

View attachment "p6nops.c" of type "text/x-csrc" (1609 bytes)

Download attachment "p6nops" of type "application/octet-stream" (10555 bytes)