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From: Thomas Gleixner <tglx@linutronix.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Miroslav Lichvar <mlichvar@redhat.com>
Subject: Re: [GIT pull] ntp updates for 2.6.31
Date: Tue, 16 Jun 2009 13:29:49 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LFD.2.00.0906161322330.2800@localhost.localdomain> (raw)
In-Reply-To: <20090616090647.GD13771@elte.hu>

On Tue, 16 Jun 2009, Ingo Molnar wrote:
> Each OS should converge back to the correct time _as fast as 
> physically possible_. If this is a problem and if someone wants 
> crappy time and longer periods of convergence for some odd reason 
> then that header file change can be edited by hand even. It's not 
> like it's that hard to change, if there's genuine interest.
> 
> So i'm against any revert on this basis. If another basis comes up 
> we can reconsider of course. What do you think?

I completely agree. 

Consistent convergence across different OSs is a wet dream. 

We see even different behaviour across kernel versions :) Also I
recently looked at an embedded system running the same kernel version
as a PC in the same network. Same version of user space tools. Main
difference aside the arch was HZ (100 vs. 1000). The PC convergence
time was about 40% higher than the embedded systems.

Thanks,

	tglx

  reply	other threads:[~2009-06-16 11:30 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-15 14:06 Thomas Gleixner
2009-06-15 20:16 ` john stultz
2009-06-15 23:41   ` john stultz
2009-06-16  9:06     ` Ingo Molnar
2009-06-16 11:29       ` Thomas Gleixner [this message]
2009-06-16 12:52       ` Miroslav Lichvar
2009-06-17 15:38         ` John Stultz
2009-06-17 16:51           ` Ingo Molnar
2009-06-17 17:23           ` Miroslav Lichvar
2009-06-17 17:26             ` Ingo Molnar
2009-06-17 17:55               ` John Stultz
2009-06-18 12:13               ` Miroslav Lichvar
2009-06-23  9:57                 ` Ingo Molnar
2009-06-23 13:16                   ` Miroslav Lichvar
2009-06-23 13:36                     ` Ingo Molnar
2009-06-23 14:33                       ` Miroslav Lichvar
2009-06-23 19:18                         ` Ingo Molnar
2009-06-23 19:49                           ` Miroslav Lichvar
2009-06-23 21:41                       ` john stultz
2009-06-24  9:29                         ` Alan Cox
2009-06-24 13:39                           ` Martin Schwidefsky

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