linux-kernel - Re: [GIT pull] ntp updates for 2.6.31

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Message-ID: <alpine.LFD.2.00.0906161322330.2800@localhost.localdomain>
Date:	Tue, 16 Jun 2009 13:29:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	john stultz <johnstul@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [GIT pull] ntp updates for 2.6.31

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
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