On Sat, Jan 18, 2003 at 12:05:22AM -0500, Ian C. Blenke wrote:
> On Fri, Jan 17, 2003 at 09:57:47PM -0500, Brian Coyle wrote:
> > Actually, yes. We all know that PC clocks are not accurate timepieces and
> > you should (as suggested) set up NTP to sync your time.
> >
> > Now, as to why your clock is drifting so quickly (27 min/3 hr.), that might
> > be a low/dead clock battery, a mis-calibrated crystal, bogus timer
> interrupts
> > or any number of reasons... You still need ntp.
>
> There are two clocks on your PC: a hardware "real time clock" (RTC), and a
> software interrupt driven one. The first is a physical battery backed up
> time source for when your PC is powered off. The latter is the clock you
> that is maintained by the Linux kernel while the system is running.
<snip...>
There is also an FAQ on the SLUG site about this. Ian's explanation is
more eloquent in explaining the theory, and the FAQ is briefer and gets
more into the nuts and bolts of _how_.
Paul
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