[ntp:questions] Influence of temperature on PC oscillators
uwe_klein_habertwedt at t-online.de
Sun Apr 15 08:08:05 UTC 2007
Hal Murray wrote:
> In article <4620bcdf$0$7511$426a74cc at news.free.fr>,
> Spoon <devnull at invalid> writes:
>>I've found the following articles rather interesting:
> I don't agree with the suggestion to disable the spread spectrum
> stuff. It's there for a reason. Effectively, your CPU will run
> slightly slower. I haven't seen anything published to indicate
> that the speed is sufficiently less stable so that ntpd will notice.
> It will be different than the nominal value, but that's not a problem.
The issues are enumerated here:
This chip forex:
does its stuff by slowly sweeping Fosz up and down.
(keep in mind that with modern MoBos the clocking is done by vco/pll and a
rather low xtal ref )
if ntpd stuff runs in near sync with this sweep you get _very_ funny effects.
( ntpd may start to see the mixing results of the ss sweep and its own
rep rate )
> It would be fun to see if you can measure it.
The nVidia nForce2 issue i posted some time ago is more pronounced with
spread spectrum enabled ( indicating a timing issue) .
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