From: Richard Cochran <richardcochran@gmail.com>
To: intel-wired-lan@osuosl.org
Subject: [Intel-wired-lan] [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource
Date: Fri, 4 Sep 2015 10:11:22 +0200 [thread overview]
Message-ID: <20150904081122.GA4201@netboy> (raw)
In-Reply-To: <B79D786B7111A34A8CF09F833429C493A90B2D1F@ORSMSX109.amr.corp.intel.com>
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 (several milliseconds) and the result will be out of date by some fraction of that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
WARNING: multiple messages have this Message-ID (diff)
From: Richard Cochran <richardcochran@gmail.com>
To: "Hall, Christopher S" <christopher.s.hall@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>,
"hpa@zytor.com" <hpa@zytor.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"john.stultz@linaro.org" <john.stultz@linaro.org>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"intel-wired-lan@lists.osuosl.org"
<intel-wired-lan@lists.osuosl.org>,
"peterz@infradead.org" <peterz@infradead.org>
Subject: Re: [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource
Date: Fri, 4 Sep 2015 10:11:22 +0200 [thread overview]
Message-ID: <20150904081122.GA4201@netboy> (raw)
In-Reply-To: <B79D786B7111A34A8CF09F833429C493A90B2D1F@ORSMSX109.amr.corp.intel.com>
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 (several milliseconds) and the result will be out of date by some fraction of that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
next prev parent reply other threads:[~2015-09-04 8:11 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-21 18:52 [Intel-wired-lan] [PATCH v3 0/4] Patchset enabling hardware based cross-timestamps for next gen Intel platforms Christopher S. Hall
2015-08-21 18:52 ` Christopher S. Hall
2015-08-21 18:52 ` [Intel-wired-lan] [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource Christopher S. Hall
2015-08-21 18:52 ` Christopher S. Hall
2015-08-22 20:17 ` [Intel-wired-lan] " Thomas Gleixner
2015-08-22 20:17 ` Thomas Gleixner
2015-09-03 23:20 ` [Intel-wired-lan] " Hall, Christopher S
2015-09-03 23:20 ` Hall, Christopher S
2015-09-04 8:11 ` Richard Cochran [this message]
2015-09-04 8:11 ` Richard Cochran
2015-09-04 14:28 ` [Intel-wired-lan] " Peter Zijlstra
2015-09-04 14:28 ` Peter Zijlstra
2015-09-04 21:12 ` [Intel-wired-lan] " Hall, Christopher S
2015-09-04 21:12 ` Hall, Christopher S
2015-09-04 13:02 ` [Intel-wired-lan] " Thomas Gleixner
2015-09-04 13:02 ` Thomas Gleixner
2015-09-04 15:10 ` [Intel-wired-lan] " Peter Zijlstra
2015-09-04 15:10 ` Peter Zijlstra
2015-09-04 15:17 ` [Intel-wired-lan] " Richard Cochran
2015-09-04 15:17 ` Richard Cochran
2015-09-04 15:41 ` [Intel-wired-lan] " Peter Zijlstra
2015-09-04 15:41 ` Peter Zijlstra
2015-09-04 16:35 ` [Intel-wired-lan] " Thomas Gleixner
2015-09-04 16:35 ` Thomas Gleixner
2015-09-04 21:01 ` [Intel-wired-lan] " Hall, Christopher S
2015-09-04 21:01 ` Hall, Christopher S
2015-09-05 8:46 ` [Intel-wired-lan] " Thomas Gleixner
2015-09-05 8:46 ` Thomas Gleixner
2015-09-05 10:04 ` [Intel-wired-lan] " Ingo Molnar
2015-09-05 10:04 ` Ingo Molnar
2015-09-04 15:32 ` [Intel-wired-lan] " Richard Cochran
2015-09-04 15:32 ` Richard Cochran
2015-09-04 21:50 ` [Intel-wired-lan] " John Stultz
2015-09-04 21:50 ` John Stultz
2015-08-21 18:52 ` [Intel-wired-lan] [PATCH v3 2/4] Added ART correlated clocksource and ART CPU feature Christopher S. Hall
2015-08-21 18:52 ` Christopher S. Hall
2015-08-22 20:26 ` [Intel-wired-lan] " Thomas Gleixner
2015-08-22 20:26 ` Thomas Gleixner
2015-08-21 18:52 ` [Intel-wired-lan] [PATCH v3 3/4] Add support for driver cross-timestamp to PTP_SYS_OFFSET ioctl Christopher S. Hall
2015-08-21 18:52 ` Christopher S. Hall
2015-08-22 20:33 ` [Intel-wired-lan] " Thomas Gleixner
2015-08-22 20:33 ` Thomas Gleixner
2015-08-22 21:17 ` [Intel-wired-lan] " Richard Cochran
2015-08-22 21:17 ` Richard Cochran
2015-08-23 8:15 ` [Intel-wired-lan] " Thomas Gleixner
2015-08-23 8:15 ` Thomas Gleixner
2015-08-23 11:25 ` [Intel-wired-lan] " Richard Cochran
2015-08-23 11:25 ` Richard Cochran
2015-08-24 20:16 ` [Intel-wired-lan] " Hall, Christopher S
2015-08-24 20:16 ` Hall, Christopher S
2015-08-25 7:31 ` [Intel-wired-lan] " Richard Cochran
2015-08-25 7:31 ` Richard Cochran
2015-08-21 18:52 ` [Intel-wired-lan] [PATCH v3 4/4] Enabling hardware supported PTP system/device crosstimestamping Christopher S. Hall
2015-08-21 18:52 ` Christopher S. Hall
2015-08-22 20:46 ` [Intel-wired-lan] " Thomas Gleixner
2015-08-22 20:46 ` Thomas Gleixner
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