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Date: Wed, 17 Apr 2002 14:26:17 -0700
From: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>
To: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
Cc: James Bourne <jbourne@MtRoyal.AB.CA>, Ingo Molnar <mingo@elte.hu>,
        linux-kernel@vger.kernel.org
Subject: Re: Hyperthreading
Message-ID: <20020417142617.B27778@vger.timpanogas.org>
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On Wed, Apr 17, 2002 at 02:10:52PM -0700, Martin J. Bligh wrote:
> > That has balanced the timer irqs.  I've also enabled hyper threading
> > (append="acpismp=force").
> > ...
> > And, you've gotta like this line:
> > Total of 4 processors activated (14299.95 BogoMIPS).
> 
> Before you get too excited about that, how much performance boost do 
> you actually get by turning on Hyperthreading? ;-)
> 

In my testing with SCI, it speeds up some operations and with 3Ware 
it increases throuput about 10 MB/S.  Not a lot but there is some 
improvement (if you can get around the lockups during boot).

Jeff


> M.
> 
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