Messages in this thread | | | From | "Ulrich Windl" <> | Date | Mon, 22 Nov 1999 15:55:21 +0200 | Subject | Re: updating the RTC automagically |
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On 22 Nov 99, at 15:36, Rogier Wolff wrote:
> Guest section DW wrote: > > On Mon, Nov 22, 1999 at > > This 11 min stuff has other evil effects, as documented: > > ------ Documentation/rtc.txt ------ > > Also, if the kernel time is synchronized with an external source, the > > kernel will write the time back to the CMOS clock every 11 minutes. In > > the process of doing this, the kernel briefly turns off RTC periodic > > interrupts, so be aware of this if you are doing serious work. > > ------ > > > > So, I would be happy if this 11 min stuff would be entirely removed. > > For my purposes, the "every 11 minutes" behaviour is great: I run NTP, > and it gets in sync a few minutes after boot (Just a few hundred ms > drift since last write to CMOS).
With my current working snapshot of PPSkit-0.9.0pre2, the periodic update is tunable (turn on/off, select interval), just to find out how the effects are. Once on this way I thought "go on marching...".
> > I agree that for people wanting more accuracy, it needs to go. How > about allowing someone like that to turn off the "write cmos every 11 > minutes:" behaviour?
Try the snapshot (echo 0 >/proc/sys/kernel/time/rtc_update # I think).
Ulrich
Gruß Uli
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