Ahoj Matej,
good work, you've made some really nice stats. I wonder if somewhat
similar interesting stats can be part of pool.ntp.org website... Maybe
the monitoring station could gather some, while doing offset monitoring.
I'd like to see such stats not only at global level, but also for
specific zones (Europe, Slovakia...)
AFAIK currently we can only see server counts for zones and offsets for
specific servers. Some nice stats could tell every time server
maintainer something like "yeah, my server is one of the best, I'll add
more of 'em" or "d'oh, this machine could be replaced"...
Let's ask Ask. :o)
Greetings from Bratislava,
Dreamy
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:
+-----------+--------------+-----+
| offset | # of servers | % |
+-----------+--------------+-----+
| <= 1 ms | 1105 | 47% |
| <= 2 ms | 1441 | 61% |
| <= 5 ms | 1925 | 82% |
| <= 10 ms | 2148 | 91% |
| <= 25 ms | 2269 | 97% |
| <= 50 ms | 2311 | 98% |
| <= 100 ms | 2330 | 99% |
+-----------+--------------+-----+
Out of 2348 servers:
+-----------+--------------+-----+
| stratum | # of servers | % |
+-----------+--------------+-----+
| 1 | 142 | 6% |
| 2 | 1592 | 68% |
| 3 | 578 | 25% |
| 4 | 26 | 1% |
+-----------+--------------+-----+
Out of 1044 servers:
+-----------+--------------+-----+
| OS | # of servers | % |
+-----------+--------------+-----+
| Linux | 658 | 63% |
| BSD | 213 | 20% |
| Windows | 30 | 3% |
| SunOS | 25 | 2% |
+-----------+--------------+-----+
More then half of the servers didn't return info about their OS, so
the last table might be off quite a bit.
Matej Snoha
On Thu, Aug 2, 2012 at 9:07 AM, [email protected] <mailto:[email protected]>
<[email protected] <mailto:[email protected]>> wrote:
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 offset <= 20 ms
> 9 had offset > 20 ms
> 1 had offset 10 s
> (measured against my stratum 2 in Prague).
>
> Your server currently shows as -24.8 ms.
>
> Also, the drop in your graph could just be a result of a network
topology
> change.
> The offset could be a result of asymetric internet connection.
>
> Hope this helps,
> Matej Snoha
Thanks that's really interesting and helps to manage my
expectations. I
hope the calibration other mentioned will resolve the offset.
Best regards,
Klaus
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