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Message-ID: <4BFD675E.6020208@zytor.com>
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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