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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 08 Apr 2005 10:32:58 -0400
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Subject: Re: rtc question
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dick hoogendijk <dick@nagual.st> writes:

> I decided to remove polling and hz=1200 from my kernel. The system was
> slower. Things run pretty smooth now (duron-800/512Mb) with the default
> HZ=100, /but/ :
> 
> Now vmware3 is complaining about the rtc : timing error, please
> increase...
> The virtual machine itself runs just fine. If it does no harm I want to
> stick to the HZ=100. What does this rtc message mean and what are the
> consequenses? An unstable system?

Depends what you mean by "unstable".  The symptom I would most expect
would be the virtual machine seeing some variation in real-time clock
rate.  In your position, I would try some intermediate values for HZ,
and see what happens.  In particular, 1000 is the usual recommended
value for faster systems, and 200 or 400 might well be okay.