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Re: [perfsonar-user] PTP supported?


Chronological Thread 
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  • From: Mark Feit <>
  • To: Tim Chown <>, Szymon Trocha <>
  • Cc: Raul Lopes <>, "" <>
  • Subject: Re: [perfsonar-user] PTP supported?
  • Date: Tue, 15 Nov 2022 15:56:35 +0000
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Tim Chown writes:


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

Yes, it has.  We wrote that in 2015 or 2016, so the situation has changed.

 

The other reason we don’t support it is that there aren’t any tools that can take advantage of PTP-capable NICs to time tag packets on their way out and in.  That would get you a very-accurate latency figure, especially at much-shorter distances than the ~50 km minimum we get with an NTP-disciplined system clock.  Unfortunately, the perfSONAR team doesn’t have the cycles to develop those tools, but we’re happy to integrate them once they exist.

 

--Mark

 


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