Re: Hyperthreading

Alan Cox (alan@lxorguk.ukuu.org.uk)
Wed, 17 Apr 2002 23:12:00 +0100 (BST)

> > 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? ;-)

10-30% typically. I've actually seen code where you can't measure the
improvement because the main cpu code path is precision tuned to the
cache...
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