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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

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Old 01-08-2008, 09:24 AM   #1
Rams3377
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CPU on FIRE!!!!!


I have a p4 2.2 GHz server and itís been complaining about the CPU overheating. For about three months Iíve been getting syslog a warning from syslog saying it is running in reduced modes. I went and checked on the box several times and the fan seems to be working just fine.
I wrote it off as a bug in RedHat, but I recently switched to debian 4 and itís continuing to do the same thing.

Iím running kernel 2.6.18. Any ideas as to what may be causing this? The thing that really gets me is that I sent the BOIS to cut the power at 84 C and itís been running for more than 40 days. Even when syslog warns me itís overheating it just continues to run. Thanks in advance!
 
Old 01-08-2008, 09:39 AM   #2
Mega Man X
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I would still replace the fan if I were you, especially if it is an old fan. I mean, it is a very cheap solution and if that does not fix the issue, at least you can rest assured that nothing is really overheating and most likely is a bug somewhere reporting the temperature wrongly.

I'd assume that the box is kept in a place that it can actually get some ventilation, not inside a closet or something like that
 
Old 01-08-2008, 10:01 AM   #3
Rams3377
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yea, I guess that is a very good point mega man... I'd rather be able to rest easy... The box is in a datacenter... SO it should be getting good air circulation. Thanks

BTW I loved that game...:-)
 
Old 01-08-2008, 11:41 PM   #4
J.W.
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What is the typical temperature of the CPU? If it's hitting 80 C, that's way, way too hot
 
Old 01-09-2008, 12:31 AM   #5
David the H.
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It's possible the cpu sensor is miscalibrated. I've had similar problems myself (though usually the other way around). Try going to your bios settings and get a baseline idling temperature reading. Make sure you let it idle for long enough for the temperature to stablize. Then you should be able to modify your /etc/sensors.conf file to make the sensor reading more accurate.

If the system really is overheating, check to make sure your cpu heatsink is correctly installed. I had one computer that overheated a lot and it turned out the heatsink wasn't in complete contact with the cpu. Also, some stock systems come with rather inadequate cpu coolers. You may consider replacing it with something more powerful.
 
Old 01-10-2008, 10:53 AM   #6
Rams3377
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Hmm, that is an insightful post dave, I never considered that. THe normal CPU temp on average loads is about 60 to 65C. But when the loads starts to get heavy it spikes up to about 80C. I'm guessing because it's not handling a heavy load that often is why it doesn't cut the power.

I'll go down there today and check the fan and make sure it's making contact witht he CPU.
 
Old 01-10-2008, 12:40 PM   #7
David the H.
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If your cpu is one of the newer types with the SpeedStep power-throttling feature, then a big spike like that isn't surprising. Power-managed chips usually run much cooler at idle, but under stress can get quite hot (2GHz+ can generate a lot of heat). My AMD dual-core does that, jumping almost 20 degrees when under full load. But then, it runs at 40 degrees when idling, so it always stays in the safe zone. My older AthlonXP system, OTOH, doesn't have throttling, and it runs at a pretty constant 50 degrees no matter what the load, jumping only a few points when fully stressed.

In any case, your numbers are way to high, even at idle. You need to discover what's causing that. If it's not just a calibration problem, then you'll have to work to get it down. At the very least, you should ensure that your case is well ventilated and has good air-flow, and that the heat-sink fins aren't all dusty. Try running it with the case open for a while and see if that helps. If so, then you might consider installing an extra case fan or two to help with the flow, if you have space for them. And again, getting a high-quality heatsink is usually also a good investment. SilentPCReview has a good rundown of good ones here. I use a Scythe Ninja myself, and it does a great job. I highly recommend it.

One more thing that may help you. Does your bios have a temperature alarm that you can set? I discovered both that my calibrations were off and my heatsink was mis-set on my old system because I had the bios set to beep when the temperature reached 70. When it started complaining to me even though the display said it was only 55, I knew something was wrong.
 
Old 01-10-2008, 07:42 PM   #8
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I'm with Dave the H. The fan on the heatsink may be fine, but what about overall airflow? does the case look like it is full of spaghetti? Is this recent, did it happen under windows (if you ever ran it)? What about the thermal paste? if it is a P4, perhaps it is time that in needs to be replaced. And you've checked the background processes, right? There's not funky stuff going on in the background, right?
 
  


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