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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: HT Benchmarks (was: /proc/cpuinfo and hyperthreading)
Date: 16 Dec 2002 15:50:04 -0800
Organization: Transmeta Corporation, Santa Clara CA
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References: <20021216223848.GA2994@werewolf.able.es> <FKEAJLBKJCGBDJJIPJLJAEOLDLAA.scott@coyotegulch.com>
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Followup to:  <FKEAJLBKJCGBDJJIPJLJAEOLDLAA.scott@coyotegulch.com>
By author:    "Scott Robert Ladd" <scott@coyotegulch.com>
In newsgroup: linux.dev.kernel
> 
> From what I can see, HT provides a 0-15% increase in performance, depending
> heavily on the type of code being run. In other words, HT helps, but it is
> *no* substitute for true multiple processors. And it is ONLY of value when
> an SMP kernel is in use.
> 

It would be interesting to compare an UP kernel with HT off to an SMP
kernel with the HT on...

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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