linux-kernel - Re: [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource

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Message-ID: <20150904151743.GB16862@localhost.localdomain>
Date:	Fri, 4 Sep 2015 17:17:43 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Hall, Christopher S" <christopher.s.hall@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"john.stultz@...aro.org" <john.stultz@...aro.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH v3 1/4] Add correlated clocksource deriving system time
 from an auxiliary clocksource

On Fri, Sep 04, 2015 at 05:10:21PM +0200, Peter Zijlstra wrote:
> I think what they're getting at is asking if there's a rate limit to
> time adjustments, without that, saving the last n transition points will
> still not cover any given length of history.

As if the ntp code isn't complex enough already - now we're adding
sample histories and adjustment rating limiting?

And all for some unknown DSP in a mythical sound card??


Thanks,
Richard



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