Steevee28 wrote: > Today, by chance, I experienced the proof: > > I logged into one of my Radios via SSH and queried the device uptime. > The device uptime showed 24 days +19:15. It was 7:00pm. > > Some hours later, I noticed that the Radio was rebooted, because it > showed the main menu instead of the clock. > Again, I logged into the device and again queried the device uptime. The > uptime now showed that the device must have rebooted at 8:16pm! > > This means that the reboot occured at a device uptime of 24 days +20:31. > This is 24.855 days, corresponding to 2^31/1000/3600/24, thus > *corresponding to an overflow of a signed 32bit timer running at > 1000Hz*. > > *So, as previously suspected, the Radios really perform 'spontaneous' > reboots at a well-defined interval of 24.855 days, caused by wrapping of > the jiffy timer.* > Please note that this timer is not based on a real-time clock, thus it > is probably not running at precisely 1000Hz. This means that the reboot > interval might be slightly different from device to device.Interesting. How > do you query the uptime? I'll check mine.
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