To hyper-thread or not to hyper-thread

[Aaron Konstam]

On Mon, 2009-12-07 at 16:42 -0500, William Hooper wrote: 
> > As far as I can tell both cores have their separate 1M cache. But
> > lshw-gui reports HT is supported
> 
> You might want to check out this blog post by Dave Jones:
> http://www.codemonkey.org.uk/2009/11/10/common-hyperthreading-misconception/
> 
> A small quote: "The ‘ht’ flag doesn’t signify the presence of
> hyper-threading or not. It signifies the presence of the ability to
> say yes or no as to whether the processor has any siblings."
> 
> -- 
> William Hooper
> 
Well actually he is only partially right. The ht appears if you have
multiple cores and if the number of siblings equals the number of  cores
hyper-threading is disabled. If it is enabled then there will be more
siblings than cores.
--
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The intelligence of any discussion diminishes with the square of the
number of participants. -- Adam Walinsky
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam at sbcglobal.net