From: Richard Cochran <richardcochran@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Christopher S. Hall" <christopher.s.hall@intel.com>,
jeffrey.t.kirsher@intel.com, hpa@zytor.com, mingo@redhat.com,
john.stultz@linaro.org, x86@kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
intel-wired-lan@lists.osuosl.org, peterz@infradead.org
Subject: Re: [PATCH v3 3/4] Add support for driver cross-timestamp to PTP_SYS_OFFSET ioctl
Date: Sun, 23 Aug 2015 13:25:56 +0200 [thread overview]
Message-ID: <20150823112556.GA8569@localhost.localdomain> (raw)
In-Reply-To: <alpine.DEB.2.11.1508231011360.3873@nanos>
On Sun, Aug 23, 2015 at 10:15:00AM +0200, Thomas Gleixner wrote:
> So why can't you take N samples from the synced hardware? It does not
> make any sense to me to switch to the imprecise mode if nsamples > 1.
Ok, then I prefer to leave this "imprecise" method in place and ...
> You can also provide a new IOCTL PTP_SYS_OFFSET_PRECISE which returns
> -ENOSYS if hardware timestamping is not available and avoid the whole
> nsamples dance for the case where we can get precise timestamps.
have this for the new way.
By keeping the imprecise method, we will be able to run both methods
on the new hardware. That will help to quantify how imprecise the old
method is.
Thanks,
Richard
next prev parent reply other threads:[~2015-08-23 11:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-21 18:52 [PATCH v3 0/4] Patchset enabling hardware based cross-timestamps for next gen Intel platforms Christopher S. Hall
2015-08-21 18:52 ` [PATCH v3 1/4] Add correlated clocksource deriving system time from an auxiliary clocksource Christopher S. Hall
2015-08-22 20:17 ` Thomas Gleixner
2015-09-03 23:20 ` Hall, Christopher S
2015-09-04 8:11 ` Richard Cochran
2015-09-04 14:28 ` Peter Zijlstra
2015-09-04 21:12 ` Hall, Christopher S
2015-09-04 13:02 ` Thomas Gleixner
2015-09-04 15:10 ` Peter Zijlstra
2015-09-04 15:17 ` Richard Cochran
2015-09-04 15:41 ` Peter Zijlstra
2015-09-04 16:35 ` Thomas Gleixner
2015-09-04 21:01 ` Hall, Christopher S
2015-09-05 8:46 ` Thomas Gleixner
2015-09-05 10:04 ` Ingo Molnar
2015-09-04 15:32 ` Richard Cochran
2015-09-04 21:50 ` John Stultz
2015-08-21 18:52 ` [PATCH v3 2/4] Added ART correlated clocksource and ART CPU feature Christopher S. Hall
2015-08-22 20:26 ` Thomas Gleixner
2015-08-21 18:52 ` [PATCH v3 3/4] Add support for driver cross-timestamp to PTP_SYS_OFFSET ioctl Christopher S. Hall
2015-08-22 20:33 ` Thomas Gleixner
2015-08-22 21:17 ` Richard Cochran
2015-08-23 8:15 ` Thomas Gleixner
2015-08-23 11:25 ` Richard Cochran [this message]
2015-08-24 20:16 ` Hall, Christopher S
2015-08-25 7:31 ` Richard Cochran
2015-08-21 18:52 ` [PATCH v3 4/4] Enabling hardware supported PTP system/device crosstimestamping Christopher S. Hall
2015-08-22 20:46 ` Thomas Gleixner
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