Re: uptime limit

[Matus UHLAR - fantomas <uhlar@fantomas.sk>]

On 19.02.09 11:38, Paa.listas wrote:
>       I have a Server running since 2007, but when I run uptime it's tells
> me the system was running for only 88 days.. There are any limits in the
> uptime utility?

I think it rotates after some ~497 days, but only with older (2.4?) kernels on
32-bit systems. Basically it happens when 32-bit counter of timer tick
(100Hz) overflows:

(2^32-1)/60/60/24/100
497.10

> $ ls -l dmesg
> 
> -rw-r--r-- 1 root root 13653 2007-07-14 07:27 dmesg
> 
>  
> 
> $ uptime
> 
>  11:27:16 up 88 days, 23:51,  1 user,  load average: 0.51, 0.25, 0.20

It's nearly 89 days... 497+89 = 586.
% date -d '586 days ago'
Sat Jul 14 15:48:53 CEST 2007

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Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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