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

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Message-ID: <20150904081122.GA4201@netboy>
Date:	Fri, 4 Sep 2015 10:11:22 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	"Hall, Christopher S" <christopher.s.hall@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"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>,
	"peterz@...radead.org" <peterz@...radead.org>
Subject: Re: [PATCH v3 1/4] Add correlated clocksource deriving system time
 from an auxiliary clocksource

On Thu, Sep 03, 2015 at 11:20:37PM +0000, Hall, Christopher S wrote:
> In addition to the network interface, ART will be used in the audio interface as well.
> We need to support the case where an audio co-processor will control the audio device.
> In this case, the get_ts() function supplied by the audio driver will be very slow
> (several milliseconds) and the result will be out of date by some fraction of that 
> amount.

Why does it take milliseconds to read one audio time stamp?

Thanks,
Richard
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