Re: [Pool] Question about precision I can expect

2012-08-02 Thread n...@jama.is
On Wednesday, August 1. 2012, 19:27:06 Maurice Janssen wrote: Did you compensate for the delay of the radio signal? Radio waves travel at about 300,000 km/s which is equivalent with a delay of 3.3 ms / 1000 km. If you are located in Iceland (judging by the TLD of your email address),

Re: [Pool] Question about precision I can expect

2012-08-02 Thread n...@jama.is
On Wednesday, August 1. 2012, 16:43:16 Matej Snoha wrote: Hi. A few months ago I did a sweep over servers listed at http://support.ntp.org/bin/view/Servers/StratumOneTimeServers . Out of the 183 reachable servers, 122 (67%) had offset = 5 ms 156 (85%) had offset = 10 ms 174 (95%) had

Re: [Pool] Question about precision I can expect

2012-08-02 Thread Ask Bjørn Hansen
Don't overestimate how accurate the monitoring system is. There are lots of factors that can shift the accuracy by a few tens of ms from time to time. If your server is in agreement with various well run servers (nearby and farther away) then trust that. The monitoring system isn't intended

Re: [Pool] Question about precision I can expect

2012-08-02 Thread Ask Bjørn Hansen
On Thursday, August 2, 2012 at 2:14 AM, Kiss Gábor wrote: What if the monitoring system Asks (sorry :) the server's own estimation about its offset? (I mean value 1.780 below) (If possible.) It depends less on _your_ network environment and probably more realistic than a single poll from you.

Re: [Pool] Question about precision I can expect

2012-08-02 Thread Matej Snoha
Hi. Yesterday I gathered some statistics about (IPv4) servers in the pool. I'm posting them here, since at least the offset part seems on topic. Offset (absolute value) measured against my stratum 2 in Prague. I used ntpdate, so it might not be that accurate. Out of 2348 servers:

[Pool] Fwd: WARNING: someone's faking a leap second tonight

2012-08-02 Thread Ask Bjørn Hansen
Hi everyone,I've been planning to add something to to the system so it checks for correct leap second announcements, it looks like I shouldn't wait until the next leap second before doing it.AskBegin forwarded message:From: Martin BurnickiSubject: Fwd: WARNING: someone's faking a leap second

Re: [Pool] Fwd: WARNING: someone's faking a leap second tonight

2012-08-02 Thread AlbyVA
Can you link those findings to something on each person's Your Servers page? Maybe right under their current score. On Thu, Aug 2, 2012 at 3:30 PM, Ask Bjørn Hansen a...@ntppool.org wrote: Hi everyone, I've been planning to add something to to the system so it checks for correct leap