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North American Network Operators Group

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Re: NTp sources that work in a datacenter (was Re: Is latency equivalent to RTT?)

  • From: Peter Lothberg
  • Date: Sun Jun 01 02:08:29 2003

> 
> In message <Pine.LNX.4.44.0305140802170.7544-100000@twin.uoregon.edu>, Joel Jae
> ggli writes:
> >
> >
> >Also if you just need  a high level of syncronization between the time on 
> >all your hosts you can just deploy one standalone ntp server, sync it 
> >against public time sources and get everything synced against that. its 
> >probably a 95% solution to most people's timeing needs.
> >
> 
> If I recall correctly, NTP assumes that latency = RTT/2.  You might 
> make it work well for his application *if* you set up your tree so that 
> your paths are each one hop, or at least symmetric over your network.

Correct, and if it's asymetric you get a static offset. My laptops
internal clock is a bigger source of error...

-P




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