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From: "Vergoz Michael \(SYSDOOR\)" <mvergoz@sysdoor.Com>
To: "Scott Robert Ladd" <scott@coyotegulch.com>,
       "Dave Jones" <davej@codemonkey.org.uk>
Cc: <linux-kernel@vger.kernel.org>
References: <FKEAJLBKJCGBDJJIPJLJAEICDLAA.scott@coyotegulch.com>
Subject: Re: Kernel for Pentium 4 hyperthreading?
Date: Sun, 15 Dec 2002 16:47:39 +0100
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Hi,

It's possible to enable HT on any pentium 4, you just have to patch the bios
:P


> Hi,
>
> What I have is, indeed, a hyperthread-enabled Pentium 4. They aren't
common;
> I obtained this one direct from Intel through their Early Access Program.
> The proof in the pudding is that both Windows XP and Linux 2.5.51
recognize
> it as having "two" processors. The motherboard is an Intel Maryville2
(i850E
> chipset), with an option to enable/disable HT on the first BIOS set-up
> screen.
>
> > Note that just because /proc/cpuinfo shows 'ht' does not mean you can
> > use it in hyperthreaded mode. To do that, you also have to have >1
> > sibling in the physical package. Non-Xeon type P4's don't have the
> > extra sibling, so don't function as a hyperthreaded CPU.
>
> Mine does, and so will any 3.06 or 3.6 GHz Pentium 4.
>
> As it is, I'm past the worst of my troubles (knock on wood!) We'll see
what
> happens in the coming days the machine gets stressed. It looks stable with
> 2.5.51 -- so I guess I'm now a Linux kernel beta tester... ;)
>
> Thanks much.
>
> ..Scott
>
> --
> Scott Robert Ladd
> Coyote Gulch Productions,  http://www.coyotegulch.com
> No ads -- just very free (and somewhat unusual) code.
>
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