linux-kernel - Re: NTP time sync

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Message-ID: <20061122195153.GC22601@flint.arm.linux.org.uk>
Date:	Wed, 22 Nov 2006 19:51:53 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Alessandro Zummo <alessandro.zummo@...ertech.it>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Brownell <david-b@...bell.net>, linuxppc-dev@...abs.org,
	Kumar Gala <galak@...nel.crashing.org>,
	Kim Phillips <kim.phillips@...escale.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andi Kleen <ak@....de>, akpm@...l.org, davem@...emloft.net,
	kkojima@...iij4u.or.jp, lethal@...ux-sh.org, paulus@...ba.org,
	ralf@...ux-mips.org
Subject: Re: NTP time sync

On Wed, Nov 22, 2006 at 08:36:33PM +0100, Alessandro Zummo wrote:
> 
> 
>  wrto the in-kernel NTP synchronization,
>  as discussed before [1], my opinion
>  is that it should be done in userland.
> 
>  Keeping it in kernel implies subtle code
>  in each of the supported architectures.
> 
>  So, if the arch maintainers agree, 
>  I would suggest to schedule it for removal.
> 
> [1] http://lkml.org/lkml/2006/3/28/358

Fine, provided there's also a shell tool that can enquire whether the
kernel is sync'd or not.  (Currently the 11-minute update does not
occur when the kernel is desynced from a time source - the RTC itself
might be more accurate in this case.)

Throwing hwclock commands into crontab such that they do not take
note of the kernel's sync status is probably a very bad move in that
respect.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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