[lug] Linux clock loses time
zlynx at acm.org
Thu Mar 13 14:20:27 MST 2003
On Thu, 2003-03-13 at 14:17, D. Stimits wrote:
> Dan Julio wrote:
> > Hey All,
> > I inherited a Dell Inspiron 4100 running Redhat Linux
> > 7.3 (version 2.4.18-3). When the machine is running
> > Linux it loses about 5 minutes every 8 hours of
> > runtime. When the machine is off the RTC keeps time
> > perfectly. I verified this by setting it and then
> > shutting down Linux. When I booted several days later
> > the RTC shown at the BIOS level and also when Linux
> > booted was right on.
> > Does anyone have an idea of why this might be?
> Recently...maybe on this list, or on a newsgroup, I don't recall
> which...someone mentioned exactly what is going on in this situation.
> Apparently when linux has had its time set at one particular moment, and
> then it is set again at some later date, linux remembers how much change
> was asked for, and the period of time over which that change occurred.
> It then self-adjusts based on that drift rate. So if you set the time,
> then set it again a week later, and perhaps again another week later,
> running linux should actually improve timing accuracy. Maybe if it is
> off a lot, then adjust it once a day until drift improves...after that
> once a week. If you dual boot and adjust from another o/s, it'll
> probably work against you instead of for you. Ditto for adjusting the
> clock from the BIOS. Personally I do not know how well this works, but
> it is logical, might be interesting to see if daily adjustments lead
> eventually to less adjustment each day (or weekly).
If you have a network connection for this computer, run ntpd and never
worry about inaccurate time again! It's nice.
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