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List:       ntp-hackers
Subject:    Re: [ntp:hackers] More on the runaway clock in FreeBSD 6
From:       "David L. Mills" <mills () udel ! edu>
Date:       2005-12-25 0:39:06
Message-ID: 43ADEA2A.1090906 () udel ! edu
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P-H,

That did it. Now, how could the TSC be off more than 7800 PPM? The 
frequency calculation is apparently done by counting the TSC cycles in 
one second measured by the timer interrupts. I can't see what's wrong 
with that.

Dave

Poul-Henning Kamp wrote:

> In message <43ABFBA5.7070808@ntp.isc.org>, Danny Mayer writes:
>
>
>> Here it is. It will save time for Dave.
>
>
> The most likely cause is that the TSC is not constant frequency,
> try using the i8254 timecounter:
>
> sysctl kern.timecounter.hardware=i8254
>
>

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