From owner-freebsd-questions@FreeBSD.ORG  Wed Dec 24 04:13:11 2008
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Date: Tue, 23 Dec 2008 20:13:10 -0800
From: "Jason C. Wells" <jcw@highperformance.net>
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Subject: Kernel Variables Sanity Check
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Based on someone elses historical message I tried changing the time 
counter from TSC to i8254

# sysctl kern.timecounter.hardware=i8254

and after doing some manual calculations I tweaked

# sysctl machdep.i8254_freq=1187216
# machdep.i8254_freq: 1193182 -> 1187216

Is doing this safe?  I'm concerned that there are unforeseen 
consequences to messing with these kernel variables.  Ntpd seems to like 
this setup.  Anything to make ntpd happy.

And if I may, why can't ntpd do this? (Don't answer that.) I use the 
FINE software to set my clock so I don't have to.  It's supposed to make 
my life easier.

Thanks,
Jason