linux-kernel - Re: NTP time sync

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Message-Id: <1164279605.5653.51.camel@localhost.localdomain>
Date:	Thu, 23 Nov 2006 22:00:05 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andi Kleen <ak@....de>
Cc:	Alessandro Zummo <alessandro.zummo@...ertech.it>,
	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>, akpm@...l.org,
	davem@...emloft.net, kkojima@...iij4u.or.jp, lethal@...ux-sh.org,
	paulus@...ba.org, ralf@...ux-mips.org, rmk@....linux.org.uk
Subject: Re: NTP time sync

On Thu, 2006-11-23 at 11:54 +0100, Andi Kleen wrote:
> > [1] http://lkml.org/lkml/2006/3/28/358
> 
> What was the answer to Matt's last question in there?
> If the existing user land does it already then 
> probably.  If not then a good migration strategy would 
> be needed.

Couldn't we have a transition period by making the kernel not rely on
interrupts ? if the NTP irq code just triggers a work queue, then all of
a sudden, all of the RTC drivers can be used and the latency is small.
That might well be a good enough solution and is very simple.

Ben


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