Heyho! On Thursday 01 April 2010 00.32:43 Dreamy wrote: > [...] When I saw this graph, > I was really badly surprised: > > http://www.pool.ntp.org/scores/193.87.160.18/graph/score.png
Nothing special here; a few net problems to start with but shaping up ok. > Does it mean my server is not suitable for pool? What makes me even > more curious is this graph: > > http://www.pool.ntp.org/scores/193.87.160.18/graph/offset.png This one *is* odd. The since wave per se is often seen related to temperature changes. But that'd be with an amplitude of a few (often not even 1) ms, not 100ms or more. (I doubt the pool's monitoring can detect this, AFAIK it's sntp based and any such sine wave would be drowned out by the noise caused by network latencies.) Also, network problems don't usually cause this. ntpd (you *are* using ntpd? Or is it another software?) is quite good at keeping reasonable time even on quite bad networks. And if you'd lose sync, I'd expect the offset to drift slowly (usually slowly enough so that it doesn't reach the magical boundary where ntpd will hard set the time back to what it gets from its "upstream" time servers.) So something is decidedly wrong with your machine. A very bad motherboard clock perhaps, or the Linux issue Dave Hart has mentioned, perhaps. (A few very raw numbers: usually I get my server to offsets within 3 to 5ms on DSL. stable sync to offsets within +/-1ms are realistic when you've got a good network connection. So your offsets of up to 100ms are waaaay out.) cheers -- vbi -- featured link: http://www.pool.ntp.org
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