At Wed, 05 Sep 2007 15:33:37 -0500 Ignoramus22620 <ignoramus22620@NOSPAM.22620.invalid> wrote:
>
> Something happened on my server that made several processes do
> intensive computations. (a bug in some of my perl scripts) That loaded
> all cores of my two dual cored CPUs at 100% CPU. I got these messages
> in /var/log/messages and a lot of "wall" messages:
>
> Sep 5 13:17:09 ak74 kernel: CPU1: Running in modulated clock mode
> Sep 5 13:17:18 ak74 kernel: CPU1: Temperature above threshold
> Sep 5 13:17:18 ak74 kernel: CPU0: Temperature above threshold
> Sep 5 13:17:18 ak74 kernel: CPU0: Running in modulated clock mode
> Sep 5 13:17:18 ak74 kernel: CPU1: Running in modulated clock mode
> Sep 5 13:17:27 ak74 kernel: CPU0: Temperature above threshold
> Sep 5 13:17:27 ak74 kernel: CPU1: Temperature above threshold
> Sep 5 13:17:27 ak74 kernel: CPU1: Running in modulated clock mode
> Sep 5 13:17:27 ak74 kernel: CPU0: Running in modulated clock mode
> Sep 5 13:17:38 ak74 kernel: CPU0: Temperature above threshold
> Sep 5 13:17:38 ak74 kernel: CPU1: Temperature above threshold
> Sep 5 13:17:38 ak74 kernel: CPU1: Running in modulated clock mode
> Sep 5 13:17:38 ak74 kernel: CPU0: Running in modulated clock mode
> Sep 5 13:17:44 ak74 kernel: CPU1: Temperature above threshold
> Sep 5 13:17:44 ak74 kernel: CPU0: Temperature above threshold
>
>
> So I think that Linux saved my ass and switched to modulated clock
> mode instead of shutting down or burning my CPU. It simply slowed
> down.
>
> Thanks for that.
>
> My question is, normally a computer can be very busy and should not
> overheat. So something physical is wrong. Would you have any idea,
> maybe I need to replace case fans or the CPU fan?
Very much likely. Fans have bearings that after a time wearout, sieze
up, and burnout the fan motor. Good old 'entropy' at work here.
>
> This is a 1U rackmount from Rackmounts Etc.
>
> I called my ISP and they confirmed that they did not have any cooling
> or heating issues on their racks.
>
> thanks
>
> i
>
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