Re: [chrony-dev] can chrony adjust H/W clock too ?

["J. Bakshi" <joydeep@xxxxxxxxxxxxxxx>]

On Wed, 21 Apr 2010 08:25:58 -0700 (PDT)
Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:



> > Yes I agree with you. The objective is to sync with ntp. But I
> > might be permitted dreaming that one day chrony can adjust the rtc
> > too.
> \
> Unfortunately no. The rtc has absolutely no mechanism to adjust its
> rate. That is entirely determined by the clock crystal that is tied
> to the rtc. chrony can determine how much that rate differs from "one
> second per second" but it cannot influence it. This is especially
> true because the only time the rtc is used is when the computer is
> off, and no program, like chrony, can run. All it can do is
> compensate for what I thinks is the rate difference of the rtc. Even
> that is only partial because the temp of the crystal ( which
> determines its rate) is different when the computer is off, and there
> is no way of knowing what that temperature was.
> 

Great clarification. Now the scenario is clear to me.

Thanks a lot 

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