From: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
To: Christian Riesch
<christian.riesch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Richard Cochran
<richardcochran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 0/2] [RFC] posix clock tuning
Date: Sat, 4 Sep 2010 20:47:39 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1009042042130.9425@router.home> (raw)
In-Reply-To: <4C828652.4060804-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On Sat, 4 Sep 2010, Christian Riesch wrote:
> Richard's idea is to support clock hardware for IEEE 1588 (PTP, Precision Time
> Protocol). Have a look at the earlier discussions:
>
> http://lkml.org/lkml/2010/8/16/90
A superficial scan does not give me any definite agreement on an approach.
The patchset also needs to be CCed to John Stultz. Without a summary I
still am not clear what this is supposed to address.
Tuning of the PTP clock can be done with driver specific configuration
rather than a new POSIX clock. That is at least how SGI_CYCLE is operating
which is similar.
> http://lkml.org/lkml/2010/8/23/49
Ok this goes more into something that may prove useful but it would be
very helpful still to have a clear discussion as to why this is all
needed. From what I can tell the functionality is already there and
another clock device (CLOCK_SGI_CYCLE) is already providing a model for
how a PTP clock could be controlled and used.
next prev parent reply other threads:[~2010-09-05 1:47 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 9:27 [PATCH 0/2] [RFC] posix clock tuning Richard Cochran
2010-09-03 9:29 ` [PATCH 1/2] posix clocks: introduce a syscall for " Richard Cochran
[not found] ` <7f4815cdfcf5bc49df4bdd09d59a4f56ca2598f5.1283504065.git.richard.cochran-3mrvs1K0uXizZXS1Dc/lvw@public.gmane.org>
2010-09-03 9:58 ` Richard Cochran
2010-09-04 14:06 ` Richard Cochran
2010-09-09 10:49 ` Thomas Gleixner
[not found] ` <alpine.LFD.2.00.1009091159260.2477-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2010-09-09 13:34 ` Richard Cochran
[not found] ` <20100909133449.GB2823-7KxsofuKt4IfAd9E5cN8NEzG7cXyKsk/@public.gmane.org>
2010-09-09 20:10 ` Thomas Gleixner
[not found] ` <alpine.LFD.2.00.1009092102150.2477-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2010-09-09 21:16 ` Thomas Gleixner
2010-09-09 22:53 ` john stultz
[not found] ` <1284072793.2762.259.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2010-09-10 9:23 ` Richard Cochran
2010-09-09 21:01 ` john stultz
[not found] ` <1284066084.2762.172.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2010-09-09 21:31 ` Thomas Gleixner
[not found] ` <cover.1283504065.git.richard.cochran-3mrvs1K0uXizZXS1Dc/lvw@public.gmane.org>
2010-09-03 9:30 ` [PATCH 2/2] posix clocks: introduce a sysfs presence Richard Cochran
[not found] ` <84124d2479b8967cac2b35f852fc0fcae6ad9444.1283504065.git.richard.cochran-3mrvs1K0uXizZXS1Dc/lvw@public.gmane.org>
2010-09-09 22:19 ` john stultz
2010-09-09 23:00 ` Alan Cox
[not found] ` <20100910000008.1483fdd7-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
2010-09-10 9:31 ` Richard Cochran
[not found] ` <20100910093135.GB10179-7KxsofuKt4IfAd9E5cN8NEzG7cXyKsk/@public.gmane.org>
2010-09-11 0:20 ` Greg KH
2010-09-09 9:58 ` [PATCH 0/2] [RFC] posix clock tuning Thomas Gleixner
[not found] ` <alpine.LFD.2.00.1009091152300.2477-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2010-09-09 12:21 ` Richard Cochran
[not found] ` <20100909122156.GA2823-7KxsofuKt4IfAd9E5cN8NEzG7cXyKsk/@public.gmane.org>
2010-09-09 12:50 ` Thomas Gleixner
[not found] ` <alpine.LFD.2.00.1009091443250.2477-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2010-09-09 15:02 ` Alan Cox
2010-09-04 17:23 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1009041221240.888-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-09-04 17:48 ` Christian Riesch
[not found] ` <4C828652.4060804-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2010-09-05 1:37 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1009042036540.9425-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-09-05 5:56 ` Richard Cochran
2010-09-05 1:47 ` Christoph Lameter [this message]
[not found] ` <alpine.DEB.2.00.1009042042130.9425-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-09-05 6:22 ` Richard Cochran
2010-09-05 7:20 ` Richard Cochran
2010-09-05 23:13 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1009051759100.3480-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-09-06 7:09 ` Richard Cochran
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