From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Cochran <richardcochran@gmail.com>
Subject: Re: [uclinux-dist-devel] [PATCH RFC net-next 2/4] bfin_mac:
 replace sys time stamps with raw ones instead.
Date: Wed, 31 Oct 2012 09:36:53 +0100
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Cc: netdev@vger.kernel.org, Miroslav Lichvar <mlichvar@redhat.com>,
	John Ronciak <john.ronciak@intel.com>,
	John Stultz <john.stultz@linaro.org>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
	device-drivers-devel@blackfin.uclinux.org,
	Jacob Keller <jacob.e.keller@intel.com>,
	uclinux-dist-devel@blackfin.uclinux.org,
	Patrick Ohly <patrick.ohly@intel.com>,
	David Miller <davem@davemloft.net>
To: Bob Liu <lliubbo@gmail.com>
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On Wed, Oct 31, 2012 at 02:29:23PM +0800, Bob Liu wrote:

> Any guide how to use ptp4l to sync system time between two machines
> over ethernet?

You can run ptp4l on two machines like this

  ptp4l -i eth0 -q -v     # master
  ptp4l -i eth0 -q -v -s  # slave

and you should see the "master offset" on the slave converge within
about 30 seconds or so.

Thanks,
Richard