[Wylug-discuss] phantom reboot.....

[Jerry Nicholls]

On Wed, 2003-10-15 at 16:11, Jim Jackson wrote:
> Just noticed my little SBC home network server was giving me for uptime
>
>   4:08pm  up 3 days, 15:02,  1 user,  load average: 0.00, 0.00, 0.00
>
> But absolutely no sign of a reboot. Indeed it last rebooted 1st June 2002.
> Seems like it's jiffy count has wrapped. I'm upto 500 days.

Yup, I've seen that on a load of servers where I used to work. We had a
planned power outage about 2 years ago, so the whole server room had
been powered back up at the same time. It's to do with the 32 bit clock
and a 100Hz jiffy. It works out to be :-

	(2^32 - 1) / 100 seconds = 497 days 2:27:52.95

> Anyone know if I can expect any funnies - not seen much yet.

It affected our old 2.0.x kernels - those servers just locked solid, but
the 2.2.x servers were fine. I've even seen NetApps do it too :)

Apart from that we saw no other issues.

Jerry.
--
Jerry Nicholls <jerry at nightwatch.org.uk>