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Date: Thu, 30 Dec 2004 21:34:33 +0100
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To: Brooks Davis <brooks@one-eyed-alien.net>
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cc: freebsd-stable@freebsd.org
Subject: Re: clock running fast
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Brooks Davis wrote:

>On Thu, Dec 30, 2004 at 11:37:04AM -0800, Javier Henderson wrote:
>  
>
>>>>/usr/sbin/ntpd -c /etc/ntp.conf -p /var/run/ntpd.pid \
>>>>- -f /var/db/ntpd.drift
>>>>        
>>>>
>>>It's generally recommended that you never trust your own clock since
>>>it's completely crap as time sources go.  It's also recommended that you
>>>use at least 5 time sources to avoid problems with bad clocks.
>>>      
>>>
>>But isn't that what the drift file is for, to improve the accuracy of
>>the local clock during those times when the configured NTP servers aren't
>>available?
>>    
>>
>
>Yes, but it can only do so much.  The clock crystals in your average PC
>are OK as clocks, but much better as thermometers so the drift
>calculations are only approximate.
>
>-- Brooks
>
>  
>
Yeap, but only if your NTPD is running fine and stable, otherwise 
drift-file can be very messy.
Check your dmesg for NTPD log before you trust drift-files.