Hal Murray wrote:
> In article <[EMAIL PROTECTED]>,
> Spoon <[EMAIL PROTECTED]> writes:
>
>>Hello,
>>
>>I've found the following articles rather interesting:
>>
>>http://www.wraith.sf.ca.us/ntp/#bios-issues
>>http://www.ijs.si/time/temp-compensation/
>>http://en.wikipedia.org/wiki/Voltage-controlled_oscillator
>>
>>Regards.
>
>
> 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:
http://www.adriansrojakpot.com/Speed_Demonz/BIOS_Guide/BIOS_Guide_02d.htm#Spread
Spectrum
This chip forex:
http://www.digchip.com/datasheets/parts/datasheet/115/W40S01-04.php
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) .
uwe
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