[ntp:questions] ntp server specs
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?
(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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