no days in uptime

[Sebastiaan]

Hi,

I have encountered a strange problem in my uptime status. I have a
computer running for over 500 days and a script that displays the uptime
in days with MRTG.

For some reason, after 497 days the uptime doesn't return day information
any more:

$ uptime
08:36:00 up 14:48, 2 users, load average: 0.08, 0.18, 0.16

and

$ cat /proc/uptime
53341.82 17513797.50


I am sure of 2 things:
- it wasn't me (I was on vacation and I don't have auto-update scripts
running)
- the computer doesn't reboot daily, since /tmp isn't cleaned

I am running kernel 2.4.18 on a PowerMac.

Any ideas what is going on here?

Thanks in advance,
Sebastiaan



--
NT is the OS of the future. The main engine is the 16-bit Subsystem
(also called MS-DOS Subsystem). Above that, there is the windoze 95/98
16-bit Subsystem. Anyone can see that 16+16=32, so windoze NT is a
*real* 32-bit system.



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[Florian Ernst]

Hello Sebastiaan!

At Wednesday 30 July 2003 08:50 Sebastiaan wrote:

> I have encountered a strange problem in my uptime status. I have a
> computer running for over 500 days and a script that displays the
> uptime in days with MRTG.
>
> For some reason, after 497 days the uptime doesn't return day
> information any more:
>
> $ uptime
> 08:36:00 up 14:48, 2 users, load average: 0.08, 0.18, 0.16
>
> and
>
> $ cat /proc/uptime
> 53341.82 17513797.50
>
>
> I am sure of 2 things:
> - it wasn't me (I was on vacation and I don't have auto-update
> scripts running)
> - the computer doesn't reboot daily, since /tmp isn't cleaned
>
> I am running kernel 2.4.18 on a PowerMac.
>
> Any ideas what is going on here?

Yep, "jiffies rollover", see

[url]http://e-zine.nluug.nl/hold.html?cid=158[/url]

for further info.

HTH,
Flo


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[Sebastiaan]

Hi,

On Wed, 30 Jul 2003, Florian Ernst wrote:

> Hello Sebastiaan!
>
> At Wednesday 30 July 2003 08:50 Sebastiaan wrote:
>

<snip>

> > For some reason, after 497 days the uptime doesn't return day
> > information any more:
> >
> > $ uptime
> > 08:36:00 up 14:48, 2 users, load average: 0.08, 0.18, 0.16
> >

<snip>

> > I am running kernel 2.4.18 on a PowerMac.
> >
> > Any ideas what is going on here?

>
> Yep, "jiffies rollover", see
>
> [url]http://e-zine.nluug.nl/hold.html?cid=158[/url]
>
> for further info.
>
> HTH,
> Flo
>

I already suspected something like this. Let's hope it's fixed in 2.6.
Sloppy bug though.

Thanks!
Sebastiaan


--
NT is the OS of the future. The main engine is the 16-bit Subsystem
(also called MS-DOS Subsystem). Above that, there is the windoze 95/98
16-bit Subsystem. Anyone can see that 16+16=32, so windoze NT is a
*real* 32-bit system.



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[Ron Johnson]

On Wed, 2003-07-30 at 04:09, Sebastiaan wrote:

> Hi,
>
> On Wed, 30 Jul 2003, Florian Ernst wrote:
>

> > Hello Sebastiaan!
> >
> > At Wednesday 30 July 2003 08:50 Sebastiaan wrote:
> >

> <snip>

> > > For some reason, after 497 days the uptime doesn't return day
> > > information any more:
> > >
> > > $ uptime
> > > 08:36:00 up 14:48, 2 users, load average: 0.08, 0.18, 0.16
> > >

> <snip>
>

> > > I am running kernel 2.4.18 on a PowerMac.
> > >
> > > Any ideas what is going on here?

> >
> > Yep, "jiffies rollover", see
> >
> > [url]http://e-zine.nluug.nl/hold.html?cid=158[/url]
> >
> > for further info.
> >
> > HTH,
> > Flo
> >

> I already suspected something like this. Let's hope it's fixed in 2.6.
> Sloppy bug though.

No, I disagree. When the kernel designers made the jiffie an unsigned
long integer, the gcc compiler did not do 64 bit arithmetic very
quickly. And something like that, on a 386 (when this was developed),
needs to be *very* efficient.

Thus, it's a reflection of reality, not a bug.
[url]http://kt.zork.net/kernel-traffic/kt20030223_206.html#1[/url]
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| Jefferson, LA USA |
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| "I'm not a vegetarian because I love animals, I'm a vegetarian |
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