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

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Message-ID: <20090623191838.GB14852@elte.hu>
Date:	Tue, 23 Jun 2009 21:18:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Miroslav Lichvar <mlichvar@...hat.com>
Cc:	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT pull] ntp updates for 2.6.31


* Miroslav Lichvar <mlichvar@...hat.com> wrote:

> > > I'm not very familiar with the PPS API, is there something 
> > > wrong with it?
> > 
> > The PPS patches i've seen just export IRQ timestamps to 
> > user-space.
> > 
> > That is not very robust in my opinion when it comes to do time 
> > approximations - to get quick, low-latency action and precise 
> > measurements it's best to keep the critical path as short as 
> > possible, and within a single source code repository: i.e. 
> > within the kernel.
> 
> That's what kernel PPS discipline does, it will be probably 
> included later. Its performance is an order or two better than the 
> PLL/FLL discipline.

Is there some kernel patch i can look at?

	Ingo
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