[ntp:questions] ntp server specs

unruh unruh at wormhole.physics.ubc.ca
Tue Jun 14 16:16:04 UTC 2011

On 2011-06-12, chipper <black at intre.nt> wrote:
> If I wanted to feed a group of linux machine from a common PPS source, what hardware and which Linux would I need?

An amplifier 
(or rather impedance matching chip) and some lines (eg 50 ohm cat5
cable) to connect the PPS to the various machines
Any Linux, with gpsd onthem and ntpd or chrony

> David Woolley wrote:
>> C BlacK wrote:
>>> If the timing on client machines needs to be tight, should the ntp
>>> server be an x86 machine with a less than accurate clock
>>> or a ntp server with a very accurate clock.
>>> I want the clients to track closely to server.
>> The clients will almost certainly be the weak link.
>> Also, if you are going sub-millisecond, you need to analyze the client
>> OS, hardware and scheduing in extreme detail.
>> If you want very tight lock of the software clock (still may have large
>> jitters in terms of real world events), you should feed them from a
>> common PPS source, rather than using ethernet for the fine synchronisation.

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