netdev - Re: [uclinux-dist-devel] [PATCH RFC net-next 2/4] bfin_mac: replace sys time stamps with raw ones instead.

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Message-ID: <CAA_GA1eLXajk+wfwf7QYVoabDDeXLZecaTFX+6JRyoaYOyztQQ@mail.gmail.com>
Date:	Thu, 1 Nov 2012 10:08:01 +0800
From:	Bob Liu <lliubbo@...il.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	netdev@...r.kernel.org, Miroslav Lichvar <mlichvar@...hat.com>,
	John Ronciak <john.ronciak@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	device-drivers-devel@...ckfin.uclinux.org,
	Jacob Keller <jacob.e.keller@...el.com>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Patrick Ohly <patrick.ohly@...el.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [uclinux-dist-devel] [PATCH RFC net-next 2/4] bfin_mac: replace
 sys time stamps with raw ones instead.

On Wed, Oct 31, 2012 at 8:46 PM, Richard Cochran
<richardcochran@...il.com> wrote:
> On Wed, Oct 31, 2012 at 05:00:55PM +0800, Bob Liu wrote:
>> On Wed, Oct 31, 2012 at 4:36 PM, Richard Cochran
>> <richardcochran@...il.com> wrote:
>> > 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
>> >
>>
>> Thank you.
>> But i'm still failed to sync system time.
>>
>> On mater:
>> -------------------------------
>> root:/> date
>> Wed Dec 20 01:31:02 UTC 2006
>> root:/>
>> root:/>   ptp4l -i eth0 -q -v
>> ptp4l[33.520]: selected /dev/ptp0 as PTP clock
>> ptp4l[33.520]: m
>> ptp4l[33.520]: driver rejected most general HWTSTAMP filter
>> ptp4l[33.520]: port 1: INITIALIZING to LISTENING on INITIALIZE
>> ptp4l[33.524]: port 0: INITIALIZING to LISTENING on INITIALIZE
>> ptp4l[39.524]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
>> .....
>>
>> -----------------------------
>> On slave:
>> root:~> date
>> Fri Jan  2 13:16:07 UTC 1970
>>
>> root:~>   ptp4l -i eth0 -q -v -s
>> ptp4l[39.624]: selected /dev/ptp0 as PTP clock
>> ptp4l[39.628]: m
>> ptp4l[39.628]: driver rejected most general HWTSTAMP filter
>> ptp4l[39.628]: port 1: INITIALIZING to LISTENING on INITIALIZE
>> ptp4l[39.632]: port 0: INITIALIZING to LISTENING on INITIALIZE
>> ptp4l[39.664]: port 1: new foreign master 00e022.fffe.fe8529-1
>> ptp4l[43.672]: selected best master clock 00e022.fffe.fe8529
>> ptp4l[43.676]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE
>> ptp4l[44.688]: master offset -7968957480 s0 adj      +0 path delay       8120
>> ptp4l[45.692]: master offset -7968953124 s0 adj      +0 path delay       9076
>> ptp4l[46.696]: master offset -7968947340 s0 adj      +0 path delay       8860
>> ptp4l[47.700]: master offset -7968941884 s1 adj      +0 path delay       8860
>> ptp4l[48.704]: master offset       4564 s2 adj   +4564 path delay       8860
>> ptp4l[48.704]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
>> ptp4l[49.708]: master offset       5154 s2 adj   +6523 path delay       9086
>> ptp4l[50.712]: master offset       3686 s2 adj   +6601 path delay       9322
>> ptp4l[51.716]: master offset       2582 s2 adj   +6603 path delay       9322
>> ptp4l[52.720]: master offset       1362 s2 adj   +6158 path delay       9438
>> ptp4l[53.724]: master offset        658 s2 adj   +5862 path delay       9438
>> ptp4l[54.728]: master offset        -85 s2 adj   +5317 path delay       9685
>> ptp4l[55.732]: master offset       -113 s2 adj   +5263 path delay       9873
>> ptp4l[56.748]: master offset         86 s2 adj   +5428 path delay       9930
>> ptp4l[57.740]: master offset        166 s2 adj   +5534 path delay       9930
>> ptp4l[58.744]: master offset       -247 s2 adj   +5171 path delay      10151
>> ptp4l[59.748]: master offset        -39 s2 adj   +5305 path delay      10151
>> ptp4l[60.752]: master offset        217 s2 adj   +5549 path delay      10151
>> ptp4l[61.756]: master offset        256 s2 adj   +5653 path delay      10128
>> .....
>
> This looks perfect. Did you fixup the wrong time stamp shift?
>
>>
>> root:~> date
>> Fri Jan  2 13:16:45 UTC 1970
>> root:~>
>>
>> The system time in slave didn't change.
>
> That is correct. Using RAW time stamping and PHC, the time in the PHC
> changes, but not the system time. The system time may be slaved to
> the PHC time using the phc2sys program.
>

How to use it？

ptp4l -i eth0 -q -v     # master
ptp4l -i eth0 -q -v -s  # slave
And on slave i should also start:  phc2sys -s /dev/ptp0 -i eth0?
But this can't work.

> Anyhow, it looks like this is working fine to me.
>
> Thanks,
> Richard

-- 
Regards,
--Bob
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