[ntp:questions] Linux 11-minute mode (RTC update)

Serge Bets serge.bets at NOSPAM.laposte.invalid
Sat Apr 5 15:32:33 UTC 2008

Hello Bill,

 On Friday, April 4, 2008 at 16:16:22 +0000, Bill Unruh wrote:

> what you really want is the drift rate of the crystal when the
> computer is shut off ( ie cooling or cold)

That's very true for workstations halted each evening; much less for
Spoon's 24/7 servers.

> all you can measure is the drift rate when it is on (warm and
> constant)

One can easely measure the power-off RTC drift rate at room temperature:
Just shutdown the machine during some hours between two well synced
invocations of hwclock --systohc, and then:

| $ awk '{printf "%+.3f ppm", -$1 / 0.0864; exit}' /etc/adjtime
| +12.345 ppm

Serge point Bets arobase laposte point net

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