From owner-freebsd-hackers@FreeBSD.ORG  Sat Aug  4 08:49:34 2007
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Date: Sat, 4 Aug 2007 09:49:32 +0100
From: "mal content" <artifact.one@googlemail.com>
To: "Peter Jeremy" <peterjeremy@optushome.com.au>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: CPU activity as percentage.
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On 04/08/07, Peter Jeremy <peterjeremy@optushome.com.au> wrote:
> On 2007-Aug-04 08:10:13 +0100, mal content <artifact.one@googlemail.com> wrote:
> >  if (sysctlbyname("kern.cp_time", cp_time, &len, 0, 0) < 0) return 0;
>
> kern.cp_time returns a set of counters that are incrememted at
> kern.clockrate{stathz}.  To calculate CPU activity, you need to look
> at the change in counters over a defined period.

*ahem*

That would explain it then.

thanks,
MC