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From: Pieter de Goeje <pieter@degoeje.nl>
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Cc: Ivan Voras <ivoras@freebsd.org>
Subject: Re: intel i7 and Hyperthreading
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On Tuesday 23 December 2008, Ivan Voras wrote:
> Mike Tancsa wrote:
> > Just got our first board to play around with and unlike in the past,
> > having hyperthreading enabled seems to help performance.... At least in
> > buildworld tests.
> >
> > doing a make -j4 vs -j6 make -j8 vs -j10 gives
> >
> > -j  buildworld time    % improvement over -j4
> > 4       13:57
> > 6       12:11            13%
> > 8       11:32            18%
> > 10      11:43            17%
>
> Thanks for posting this!

What's missing is build times with hyperthreading disabled.
make buildworld -j10 could easily be faster than -j4 even when hyperthreading 
is disabled, because of increased disk I/O concurrency.

11:43 to build world is very fast indeed :-)

-- 
Pieter de Goeje