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Date: Tue, 15 Aug 2006 10:39:42 -0400
From: Mark Lord <lkml@rtr.ca>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: HT not active
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Alan Cox wrote:
>
> Hyperthreading must be BIOS enabled, its not something Linux can "turn
> on". The "ht" flag merely indicates that the processor supports
> hyperthreading not that it is enabled.

Not quite.  Even non-HT CPUs report the ht flag (I have one here).
As somebody else said, ht just means the system supports querying
the number of ht "siblings", even though that number might be zero.

Somewhat misleading, though technically accurate.

Cheers