linux-kernel - Re: [PATCH 0/2] [RFC] posix clock tuning

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Message-ID: <alpine.DEB.2.00.1009042042130.9425@router.home>
Date:	Sat, 4 Sep 2010 20:47:39 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Christian Riesch <christian.riesch@...il.com>
cc:	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 0/2] [RFC] posix clock tuning

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.

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