Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: Time precision, adjtime(x) vs. gettimeofday | From | Benjamin Herrenschmidt <> | Date | Wed, 08 Oct 2003 20:22:04 +0200 |
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> I repeat the question: what are the values of drift on the machines > that encounter the problem ? Is this drift stable or unstable?
So far, there is no problem. The problem that was happening was a via_calibrate_decr() bug with HZ != 100, but when investigating, I figured out that we had a potential problem there, that's all and that's why I want people like you who know those problems well to state if it's worth bothering ;) > > > > On all cases, those will drift some way from what the NTP server will > > give, either a lot or not, it will. So we may end up adjusting our > > kernel rate and thus opening a window for the problem. > > The worst variations of drift I've seen are a few ppm for a given > machine, barring the occasional boot-time calibration problems that > I have encountered.
OK.
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