Messages in this thread | | | Date | Fri, 04 Dec 1998 14:02:42 -0500 | From | Kris Karas <> | Subject | Re: Linux timekeeping plans |
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Stefan Monnier wrote:
> I must say (as an NTP user) that I don't understand: why don't you just > allow xntpd to use the RTC as a local clock and let xntpd slave ths system > clock with it ?
The RTC has a precision of 1 second, if memory serves, even though it can generate interrupts more rapidly. In order for the system to derive more precision, it must do what hwclock(8) does - watch carefully for the transition of the seconds digit, and set the kernel's fractional-seconds portion of the time to zero. This is inherently costly to do. If memory also serves, the RTC is a slow device - reading it may take a microsecond or more more per byte.
-- Kristofer Karas * kXtXk@bigfoot.com (delete X's) AMA/CCS DoD RF900RR HawkGT !car * Senior systems engineer/SysAdmin "Build a system that even a fool can use, * BI Deaconess Medical Center, Boston and only a fool will want to use it." * Will design LISP machines for food
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