Re: Why touch the CMOS clock?

Herbert Rosmanith (
Sat, 11 May 1996 18:41:59 +0200 (MET DST)

> This is essentially right. But the kernel can also do elaborate time-ke=
> eping
> using external clocks (eg. radio clocks) or network services (NTP...),
> which renders the kernel time *much* more precise than the RTC. The
> kernel therefore needs to update the RTC in order to limit its drift.

If you dont have the chance to update your clock via ntp, then the
RTC is *much more* accurate than the internal, interrupt driven timer-clock.
After one or two weeks uptime, the interrupt clock had a drift of two hours,
reported a friend of mine. We fixed this by "clock -r" every hour.
I hope the kernel does *not* update the RTC itself , now does it ?