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] <[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 > _______________________________________________ > pool mailing list > [email protected] > http://lists.ntp.org/listinfo/pool >
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