Re: Time keeps on slippin, slippin... (serious clock drift; suggestions??)
On 2009-04-14_19:28:40, ponga wrote:
> Greetings Debian Masters!
>
> I've just assembled two linux systems, both with identical (brand new)
> Gigabyte mobo's, though my Debian Lenny is running a slightly slower
> AMD dual core proc than the other Ubuntu Intrepid system.
>
> My problem is some SERIOUS system clock drift on the Lenny system.
> Around 4 minutes (slow) every hour. I have no idea how to correct
> this. I think the hwclock is not much better as far as accuracy goes,
> but have not analyzed it as close as the system clock. All I know is,
> ntpdate corrects the time, but an hour latter... I'm missing 4
> minutes!
>
> Any help would be appreciated!! (Btw, I've installed adjtimex, but to
> no avail... perhaps I don't know what I'm doing, though...)
>
> TIA,
> -ponga
I guess that you have an outlier xtal(s) in your motherboard clock(s).
Look into the package chrony. It is an ntp client/server and more: It
tracks the setting *and* the rate of the local clock. It brings the
setting into agreement with network time by adjusting the clock rate
so that local clock difference for network time closes gradually to zero,
the keep tweeking the rate to keep the setting correct. It starts off
getting ntp time frequently and as it learns what parameters are needed
to correct for the local clock as manufactured. It backs off on the
frequency of its ntp queries. All in all, a remarkably well done solution.
--
Paul E Condon
pecondon@mesanetworks.net
Reply to: