On Fri, Oct 07, 2005 at 15:40:12 +0530, Manas Anant Alekar wrote: > I have an board running linux 2.6.9. The board does not have the RTC > configured. > > If I write a module to print time, I see that this kernel clock drifts 3 > minutes from a standard stop watch in 18 hours. > > Is this drift expected from the linux kernel? It depends on the hardware. It seems that your interrupt controller has quite a bad time source. Anyway, you can work around the problem by using some program, that can estimate the systematic drift (by NTP (even if you only connect to internet occasionaly) or manual correction from time to time) and compensate for it using adjtimex or at least adjtime system call. The chrony daemon is known to work in (and in fact to have been desinged for) such situation. -- Jan 'Bulb' Hudec <bulb@xxxxxx>
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