From: Kurt Roeckx <Q@ping.be>
To: Ian Maclaine-cross <iml@ilm.mech.unsw.edu.au>
Cc: linux-kernel@vger.kernel.org, Ian Maclaine-cross <iml@debian.org>
Subject: Re: PROBLEM: Linux updates RTC secretly when clock synchronizes
Date: Wed, 31 Oct 2001 02:05:38 +0100 [thread overview]
Message-ID: <20011031020538.A354@ping.be> (raw)
In-Reply-To: <20011031113312.A8738@ilm.mech.unsw.edu.au>
In-Reply-To: <20011031113312.A8738@ilm.mech.unsw.edu.au>; from iml@ilm.mech.unsw.edu.au on Wed, Oct 31, 2001 at 11:33:12AM +1100
On Wed, Oct 31, 2001 at 11:33:12AM +1100, Ian Maclaine-cross wrote:
>
> PROBLEM: Linux updates RTC secretly when clock synchronizes.
>
> When /usr/sbin/ntpd synchronizes the Linux kernel (or system) clock
> using the Network Time Protocol the kernel time is accurate to a few
> milliseconds. Linux then sets the Real Time (or Hardware or CMOS)
> Clock to this time at approximately 11 minute intervals. Typical RTCs
> drift less than 10 s/day so rebooting causes only millisecond errors.
This is all in the manpage, see man hwclock. If you use ntpd,
you probably don't want hwclock to adjust, just set the time.
Kurt
next prev parent reply other threads:[~2001-10-31 1:05 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-31 0:33 PROBLEM: Linux updates RTC secretly when clock synchronizes Ian Maclaine-cross
2001-10-31 1:05 ` Kurt Roeckx [this message]
2001-10-31 2:55 ` Ian Maclaine-cross
2001-10-31 11:52 ` Kurt Roeckx
2001-11-01 0:52 ` Riley Williams
2001-11-01 1:26 ` Kurt Roeckx
2001-11-01 13:57 ` Alex Bligh - linux-kernel
2001-11-02 9:50 ` Riley Williams
2001-11-03 11:41 ` Alex Bligh - linux-kernel
2001-11-03 18:35 ` Riley Williams
2001-11-03 19:19 ` Alex Bligh - linux-kernel
2001-11-03 21:04 ` Kurt Roeckx
2001-11-06 10:01 ` Pavel Machek
2001-11-06 9:57 ` Pavel Machek
2001-11-02 12:16 ` Pavel Machek
2001-11-05 23:08 ` Riley Williams
2001-11-06 10:17 ` Pavel Machek
2001-11-07 0:00 ` Riley Williams
2001-11-07 0:44 ` Alex Bligh - linux-kernel
2001-11-07 1:01 ` Kurt Roeckx
2001-11-07 1:15 ` Alex Bligh - linux-kernel
2001-11-07 9:24 ` Russell King
2001-11-08 12:26 ` Pavel Machek
2001-11-08 23:00 ` Riley Williams
2001-11-09 9:32 ` Pavel Machek
2001-11-09 21:11 ` Riley Williams
2001-11-09 21:30 ` Pavel Machek
2001-11-09 22:54 ` Riley Williams
2001-11-09 23:10 ` Mark Zealey
2001-11-10 20:04 ` Pavel Machek
2001-11-10 20:35 ` Riley Williams
2001-11-10 20:43 ` Pavel Machek
2001-11-10 20:49 ` Doug McNaught
2001-11-06 0:20 ` Ian Maclaine-cross
2001-11-06 10:18 ` Pavel Machek
2001-11-08 5:09 ` Ian Maclaine-cross
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