Linux-kernel mailing list archive 2000-15,: Re: odd rtc message on alpha

# Re: odd rtc message on alpha

Guest section DW (dwguest@win.tue.nl)
Mon, 10 Apr 2000 10:38:32 +0200

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On Mon, Apr 10, 2000 at 10:58:31AM +0900, Tom Holroyd wrote:

> Apr 9 06:00:00 holly kernel: set_rtc_mmss: can't update from 59 to 0
>
> Alpha DP264 (1 cpu), running 2.3.99-pre3 and NTPD. Never saw that before.
> [RTC not enabled in the kernel.]

That is the infamous `11 minutes mode' where the kernel decides
every eleven minutes to change your hardware clock, in order to
make measurements of the drift of the hardware clock impossible.

Since the kernel does not know about the timezone, it will
only adapt the minutes, not the hours, and will not move the rtc
past a 30-min boundary.

[And examination of linux/arch/alpha/kernel/Makefile shows
that time.o is linked into the kernel independent of CONFIG_RTC.]

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