linux-kernel - Re: [PATCH] x86: Export tsc related information in sysfs

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Date:	Wed, 26 May 2010 11:24:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	john stultz <johnstul@...ibm.com>
CC:	Brian Bloniarz <bmb@...enacr.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Venkatesh Pallipadi <venki@...gle.com>, chris.mason@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Export tsc related information in sysfs

On 05/26/2010 09:25 AM, john stultz wrote:
> 
> Brian: is this something the NTPd folks actually want? Has anyone
> checked with them before we hand down the solution from high upon on
> lkml mountain?
> 
> Personally I think NTPd should be a little more savvy about how far it
> trusts the drift file when it starts up. Since I believe its
> fast-startup mode can quickly estimate the drift well within 100ppm,
> which is about the maximum variance I've seen from the calibration code.
> 

Engaging with them is probably a good idea.  In the past, the NTP core
folks have been extremely anti-Linux and pro-BSD and therefore unwilling
to talk, but that has at least in part been due to what they perceive as
unilateral actions on our part.

	-hpa

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