Date: Thu, 1 Oct 1998 11:51:51 +0100 From: "Andy.Robb" <Robb.Andy@x-tension.com> To: "'freebsd-questions@FreeBSD.ORG'" <freebsd-questions@FreeBSD.ORG> Subject: training timeofday clock with ntpdate Message-ID: <B766A4A0DB0BD2119BF40000F824778EE42F@mailhost.x-tension.co.uk>
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Request: Please can you allow adjtime() calls to trim the system clock? Preferably, accumulate the adjustments in a file (probably ignoring large adjustments). This file could be read at bootup to trim the system clock. Background: I understand that the kernel includes code to trim the clock frequency when using xntpd. However, xntpd raises the ISDN line to our ISP every few minutes. I would like to be able to use the accumulated error from ntpdate (say) to train the kernel's clock to be within 0.5 sec/day (typically 0.1 sec/day) and use ntpdate just once a day. I know that Irix from SGI supports this kind of technique with both "timed" and "timeslave" daemons - albeit through special system calls. I have written programs using ICMP TIMESTAMP messages to synchronise both Linux (using adjtime) and HP-UX 9 systems (hacking the kernel) to a group of SGI systems that co-operated with timed. Many thanks for a great system, Andy Robb. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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