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Re: [perfsonar-user] PTP supported?


Chronological Thread 
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  • From: Tim Chown <>
  • To: Szymon Trocha <>
  • Cc: Raul Lopes <>, "" <>
  • Subject: Re: [perfsonar-user] PTP supported?
  • Date: Tue, 15 Nov 2022 11:37:52 +0000
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> On 14 Nov 2022, at 15:03, Szymon Trocha <> wrote:
>
> Hi Raul,
>
> W dniu 10.11.2022 o 19:35, Raul Lopes (via perfsonar-user Mailing List)
> pisze:
>> Dear perfsonar team,
>>
>> Is PTP supported in perfSONAR?
>>
> I addition to what Ed replied - I'm wondering about the rationale behind
> your question. Is PTP configured and used in JISC? Is it going to be your
> replacement of NTP?
>
> (https://docs.perfsonar.net/FAQ.html#q-does-perfsonar-support-ptp)

No, at this stage there’s no PTP service on Janet. But other NRENs are
starting to offer one, and we’re in the process of looking at use cases. One
may well be more accurate OWD measurements.

One thing the perfSONAr community could do, or a researcher in it, is look at
the existing latency measurements each way between measurement points and see
how they correlate, and whether there is clock drift. My feeling is that
mostly in R&E networks there’s ~1ms accuracy based on existing NTP driven
timing.

The current perfSONAr docs say PTP is not supported due to the cost of
deploying it. I think that has changed.

Tim

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