On 1/12/2021 3:59 PM, Vladimir Oltean wrote:
> On Tue, Jan 12, 2021 at 12:51:50PM -0800, Richard Cochran wrote:
>> On Tue, Jan 12, 2021 at 08:06:01PM +0200, Vladimir Oltean wrote:
>>>
>>> I'm looking for a way to block a shell script until phc2sys and ptp4l
>>> have reached within a certain offset from the grandmaster (say +/- 50 ns).
>>> Let's say I can write a program based on pmc which monitors the
>>> master_offset from TIME_STATUS_NP, but what about phc2sys?
>>
>> We don't have any kind of management interface or IPC to phc2sys, but
>> you might try this from your shell script.
>>
>> $ phc_ctl -q eth6 cmp
>>
>> phc_ctl[326755.414]: offset from CLOCK_REALTIME is 111513ns
>>
>> The script can evaluate that last word.
>
> Actually the reported offset should also include the UTC offset, which
> should be retrieved from currentUtcOffset from TIME_PROPERTIES_DATA_SET,
> which requires pmc, which......
>
> If I was willing to create, for inclusion into linuxptp, an all-in-one
> program that waits until a certain clock is synchronized, how would that
> ideally look, in your opinion? Lack of management PTP messages for
> phc2sys means that I currently need to check sync by ssh'ing into the
> destination machine and run a script on that. At that stage, it doesn't
> really even matter if that script just scrapes some logs or measures the
> offset itself, since all the good parts of having pmc have already been
> lost by needing to ssh into a remote station.
>
Well PMC has to connect over the network using the management
interface.. do we even expose the non-portable commands over the network?
In theory you could possibly add some sort of non-portable management
message.. but then ptp4l would have to query the phc2sys application to
get this data...
I do think a method of querying phc2sys status without text scraping
would be useful, though I am not sure it fits into Richard's goals for
this project...
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