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From: Peter Zijlstra <peterz@infradead.org>
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 17:41:33 +0200	[thread overview]
Message-ID: <20150904154133.GI18489@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150904151743.GB16862@localhost.localdomain>

On Fri, Sep 04, 2015 at 05:17:43PM +0200, Richard Cochran wrote:
> 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??

Hehe, I'm just a 'translator' here. But going by you answer I'm taking
it there isn't in fact a rate-limit to adjustments. Which, even if you
were not opposed to that direction, makes it an unfeasible proposition.

Also, I'm not thinking its too mythical, sound/soc/intel/ is full of
audio DSP stuff, I think a newer version will just gain ART support.

WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Richard Cochran <richardcochran@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	"Hall, Christopher S" <christopher.s.hall@intel.com>,
	"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>
Subject: Re: [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource
Date: Fri, 4 Sep 2015 17:41:33 +0200	[thread overview]
Message-ID: <20150904154133.GI18489@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150904151743.GB16862@localhost.localdomain>

On Fri, Sep 04, 2015 at 05:17:43PM +0200, Richard Cochran wrote:
> 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??

Hehe, I'm just a 'translator' here. But going by you answer I'm taking
it there isn't in fact a rate-limit to adjustments. Which, even if you
were not opposed to that direction, makes it an unfeasible proposition.

Also, I'm not thinking its too mythical, sound/soc/intel/ is full of
audio DSP stuff, I think a newer version will just gain ART support.

  reply	other threads:[~2015-09-04 15:41 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       ` [Intel-wired-lan] " Richard Cochran
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             ` Peter Zijlstra [this message]
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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