linux-kernel - Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.

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Date:	Fri, 1 Dec 2006 16:56:38 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Ben Collins <ben.collins@...ntu.com>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] [x86] Add command line option to enable/disable
 hyper-threading.

> So I think people have blown those SSL timing attacks _way_ out of 
> proportion, just because it sounds technical and cool. 
> 
> Besides, most of the time you can disable HT in the BIOS, which is better 
> anyway if you don't want it.

Agreed - but the SSL thing is an irrelevance. The main reason for
disabling HT (especially on a single core CPU) is because a lot of
workloads run faster with HT *off*.

Alan
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