Hal Murray wrote: >>> This is good because it's generally farther from the heat >>> generating CPU than the CPU crystal. > >> This has no hold in reality. > > It's not what I was expecting. Several years ago, I was trying to match the > temperature of the crystal with the observed drift. The data looked a lot > better after Dave Mills pointed out that I was measuring the temperature of > the wrong crystal. > http://www.megapathdsl.net/~hmurray/ntp/drift.gif > http://www.megapathdsl.net/~hmurray/ntp/drift-ex.gif > > I think he said it was done that way in order to support SMP systems. I'm > pretty sure it works that way on this old Linux box. I probably jumped to > the conclusion that it was more common than it is. > > Anybody got a list of which systems use which crystal? > > > >
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