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Date: Mon, 14 Aug 2006 11:32:10 -0400
To: "linux-os (Dick Johnson)" <linux-os@analogic.com>
Cc: Robert Hancock <hancockr@shaw.ca>,
       Jan Engelhardt <jengelh@linux01.gwdg.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: HT not active
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From: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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On Mon, Aug 14, 2006 at 10:51:47AM -0400, linux-os (Dick Johnson) wrote:
> It's mostly a motherboard issue. This board is an Intel motherboard.
> However, Intel decided to not allow HT (strange). I tried to
> bring the MB back to CompUSA, but they declared; "The board is
> not defective. Windows doesn't use hyper threading, and this is
> a windows-only board...." They claim no board is compatible with
> Linux. They were perfectly willing to give me back my money, but
> they would not guarantee that any of their motherboards were
> "compatible" with Linux. With an attitude like that, one can
> quickly learn where not to buy motherboards.

It is both a motherboard (bios actually) and cpu issue.

> processor	: 0
> vendor_id	: GenuineIntel
> cpu family	: 15
> model		: 2
> model name	: Intel(R) Pentium(R) 4 CPU 2.80GHz
> stepping	: 7
> cpu MHz		: 2794.381
> cache size	: 512 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 vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr
> bogomips	: 5592.62

I have a P4 2.8GHz which does do HT.  It is family 15, model 2, stepping
9.  Stepping 7 is probably from just before intel started enabling HT
support.  The P4A Northwood did not have HT and came in 1.6 to 2.8GHz
(400FSB).  The P4B Northwood did have HT on the 3.06Ghz model only and
came in 2.0 to 3.06Ghz (533FSB).  The P4C Northwood had HT and came
in 2.4 to 3.4GHz (800FSB).  I have the P4C 2.8GHz which is showing as
model 2 stepping 9.

> The solution may be, in the future, to bring a bootable CR/ROM with you
> when buying motherboards or CPUs.... and get stuff off the net that's
> guaranteed to do what you want. This exact same software, exact same
> configuration ".config" file, produces this on another machine:

Who wants to buy a power wasting P4 now, when they can instead get the
Core 2 or an Athlon 64 which run faster using less power?

> processor	: 0
> vendor_id	: GenuineIntel
> cpu family	: 15
> model		: 2
> model name	: Intel(R) Xeon(TM) CPU 2.40GHz
> stepping	: 9
> cpu MHz		: 2399.779
> cache size	: 512 KB
> physical id	: 0
> siblings	: 2
> core id		: 0
> cpu cores	: 1
> fdiv_bug	: no
> hlt_bug		: no
> f00f_bug	: no
> coma_bug	: no
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 2
> wp		: yes
> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr
> bogomips	: 4804.62

So this is a model 2 stepping 9 just as my P4 is and HT works just like
my P4 does.

I can't actually find a list that says when stepping had what feature
enabled.

--
Len Sorensen
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