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

Christoph Lameter
2010-09-05T01:47:39Z

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.