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

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Message-ID: <1274905177.3383.47.camel@localhost.localdomain>
Date:	Wed, 26 May 2010 13:19:37 -0700
From:	john stultz <johnstul@...ibm.com>
To:	"H. Peter Anvin" <hpa@...or.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 Wed, 2010-05-26 at 11:51 -0700, H. Peter Anvin wrote:
> On 05/26/2010 11:44 AM, Brian Bloniarz wrote:
> > On 05/26/2010 12:25 PM, 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?
> > 
> > I haven't checked, it's been a while since I dealt with
> > this problem. The NTP maintainers definitely complain about the
> > quick TSC calibration code like it's a bug:
> > (e.g. http://www.mail-archive.com/questions@lists.ntp.org/msg02079.html).
> > Anyway I'll reach out before I spend any time investing in
> > a solution that they don't want (and you don't like :).
> > 
> 
> Yes, Prof. Mills in particular (for those who don't know, he's "Mr.
> NTP") really gets upset about the way Linux does timekeeping.
> Unfortunately it's not clear to me that he's willing to work with us as
> opposed to wanting things to work exactly like BSD, and swive the
> non-NTP users.

Although I suspect his dislike for Linux is historical, as Roman
reworked the ntp code to follow the NTPv4 reference implementation back
in the 2.6.19 timeframe.

However I'd be more then happy to try to address any specific
deficiencies with Linux's NTP implementation if someone can better
express Prof Mills' critiques are.

thanks
-john




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