[ntp:questions] slow SHM time source
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Mon Aug 12 19:01:53 UTC 2013
Nikolai Orekhov wrote:
> ntpd 4.2.6
> I've got a SHM driver source but time samples can come very rarely.
> May be once per 30min or once per 1min.
> Also I've got an NTP server.
> I know that it's not good to have two servers so I've
> marked them both "true". Also "maxpoll 3" and "iburst"
> is set on both of them.
> The problem is when SHM driver receives a sample
> ( only one sample ) than somehow it's jitter becomes
> = 0.01 and it becomes sys.peer instead of ntp
> server which becomes candidate.
> Still it's dispersion is about 3900.
Prefer the NTP server?
Setting them to true sounds like a recipe for disaster?
Maxpoll 3 sounds excessive? Does it cause a lot of jitter?
Especially on something that updates only once every minute
to 30 minutes, in fact anything faster than minpoll 5
on that resource should be of no value.
Certainly don't set minpoll or maxpoll that low for a NTP
server that does not belong to you.
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