From: Mikael Pettersson <mikpe@csd.uu.se>
To: b_adlakha@softhome.net, davej@codemonkey.org.uk
Cc: linux-kernel@vger.kernel.org
Subject: Re: HYPERTHREADING on older P4???
Date: Wed, 5 Feb 2003 18:43:13 +0100 (MET) [thread overview]
Message-ID: <200302051743.SAA11495@kim.it.uu.se> (raw)
On Wed, 5 Feb 2003 13:07:07 +0000, Dave Jones wrote:
>There are countless rumours of being able to enable extra siblings
>by poking MSRs, but not one person has to my knowledge achieved this.
>Some folks have also allegedly found that snipping pins or wiring extra
>bits to them have enabled the 'extra sibling'. Whether this is true or
>not, and whether it is 100% equivalent to a real HT part is again,
>questionable.
HT-capable P4s decide at RESET (or INIT?) time whether to enable
the second thread or not by sampling one of the data or address pins.
The chipset is supposed to drive that pin low or high according to
how HT has been set up in the BIOS. This is mentioned in the
3.06 GHz P4 data sheet.
/Mikael
next reply other threads:[~2003-02-05 17:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-05 17:43 Mikael Pettersson [this message]
2003-02-06 20:21 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2003-02-10 21:59 Margit Schubert-While
2003-02-11 11:42 ` b_adlakha
2003-02-11 15:03 ` Pawel Bernadowski
2003-02-05 13:02 b_adlakha
2003-02-05 13:07 ` Dave Jones
2003-02-05 21:55 ` Eric W. Biederman
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