linux-kernel - Re: [RFC][PATCH] Adjust SHIFT_PLL to improve NTP convergence.

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Message-ID: <49FF87F1.4090403@redhat.com>
Date:	Mon, 04 May 2009 20:27:29 -0400
From:	Rik van Riel <riel@...hat.com>
To:	john stultz <johnstul@...ibm.com>
CC:	lkml <linux-kernel@...r.kernel.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>, linux@...izon.com,
	Ulrich Windl <ulrich.windl@...uni-regensburg.de>
Subject: Re: [RFC][PATCH] Adjust SHIFT_PLL to improve NTP convergence.

john stultz wrote:
> With the v2.6.19 Linux kenrel, Roman converted the in-kernel NTP code to
> the NTPv4 reference model. 

> I then modified the SHIFT_PLL value (which defines how stiff NTP's freq
> correction is), setting it to 2, and created the second attached image
> (2.6.30-pll2.png), comparing against the 2.6.18 numbers in the first
> chart.

> Signed-off-by: John Stultz <johnstul@...ibm.com>

Acked-by: Rik van Riel <riel@...hat.com>

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