Serge Bets <[EMAIL PROTECTED]> writes:
>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
Sure, and you can also do it with a lab full of equipment and a good time
source. That is not the question under discussion. The question is whether
or not the drift compensation in hwclock is worthwhile. I would say a bit,
but much less than you might think.
>Serge.
>--
>Serge point Bets arobase laposte point net
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