Hello, all, I'm just reading the advice we offer to ntp client vendors, http://www.pool.ntp.org/de/vendors.html#basic-guidelines , section "Implementation specifics":
> Do have your devices query the NTP servers at random times of > the day. For example every 43200 seconds since boot is good, at > midnight every day is bad. I completely agree that "at (some hard-wired time) every day" is bad for any vendor that puts out more than a few devices. But I'm afraid of the "every 43200 seconds since boot" stuff, too... I imagine a big city with many devices. Or maybe just a big factory yard deploying thousands of little devices integrated into heaven-knows-what, all with the same ntp client build in. That client diligently follows the rule. Doesn't matter much whether the devices are from the same vendor or not. Say, power goes off at some time and comes back up at some time. For the sake of example, say comes back at 3:17 UTC. Many devices boot - simultaneously. Two load spikes each day result, at 3:17 UTC and 15:17 UTC. Those two spikes are there to stay, during the life-time of the devices. Unless the factory yard finds a way to switch off and back on the little devices, one at a time. Am I being paranoid here, or is this something we should consider? Regards, Andreas _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
