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Date:	Tue, 22 Jul 2014 18:29:40 +0200
From:	Peter Zijlstra <>
To:	Pawel Moll <>
Cc:	John Stultz <>,
	Steven Rostedt <>,
	Ingo Molnar <>,
	Oleg Nesterov <>,
	Andrew Morton <>,
	Mel Gorman <>,
	Andy Lutomirski <>,
	Stephen Boyd <>,
	Baruch Siach <>,
	Thomas Gleixner <>,
	lkml <>
Subject: Re: [RFC] sched_clock: Track monotonic raw clock

On Tue, Jul 22, 2014 at 05:17:23PM +0100, Pawel Moll wrote:
> > Now, I already mentioned max error bounds, and I've not yet looked at
> > your actual control loop, but that is something to keep in mind, we want
> > something that's limited.
> Indeed. Richard has already expressed concerns that my coefficients
> won't work everywhere (as in with different clock rate ratios) and he's
> most likely right. My money is on a more advanced, "self-tuning"
> solution, where we definitely need an escape condition.

I was wanting to look up software PLLs, as I seem to remember that's
what NTP and PTP use, but Richard should know I think.

Its not really a subject I've looked at before.
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