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SZwarts
l33t
Joined: 13 Oct 2003
Posts: 629
Location: Sydney, NSW, Australia
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 Posted: Sat Dec 18, 2004 10:36 am Post subject: hwclock precision |
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Hi, I wonder somehting about the hardware clock, when I
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$ hwclock --systohc
$ hwclock
Sat Dec 18 21:35:23 2004 -0.499403 seconds
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Why is there a difference of almost half a second (usually this delay differs each time)
Half a second is like ages for a machine which is capable of doing millions and millions of instuctions every second. Can somebody explain me the lack of precision here?
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bunder
Bodhisattva
Joined: 10 Apr 2004
Posts: 5937
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| Posted: Sat Dec 18, 2004 10:47 am Post subject: |
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The hardware clock will drift. The crystal inside it is not as accurate as an atomic clock, so I wouldn't worry much. I lose 14 seconds a day on one of my PC's. Thank god for NTP.
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SZwarts
l33t
Joined: 13 Oct 2003
Posts: 629
Location: Sydney, NSW, Australia
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| Posted: Sat Dec 18, 2004 11:31 am Post subject: |
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I understand that it will lose a couple of secs over time... That's the crystal of the hardware clock ok... But this has nothing to do with that I gues.. I lose half a second withing setting and reading... And if I read it again the offset is different again by a couple of tens of seconds.
It's not that I'm worried about it, I see it with all the computers, but I'm just very curious... Half a second is like eternity for a computer and still it's off by that all the time...
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Kernel & Hardware
