Date: Fri, 21 Jan 2005 13:22:12 +0000 From: Jason Henson <jason@ec.rr.com> To: freebsd-questions@freebsd.org Subject: Re: My computer keeps crashing Message-ID: <1106313732l.51518l.0l@BARTON> In-Reply-To: <004801c4ff9d$6b9dab60$0501a8c0@SPECULUSHX1THE> (from calculus@softhome.net on Fri Jan 21 04:41:45 2005) References: <002801c4ff4d$0ad34880$0501a8c0@SPECULUSHX1THE> <1106283993l.49858l.4l@BARTON> <004801c4ff9d$6b9dab60$0501a8c0@SPECULUSHX1THE>
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On 01/21/05 04:41:45, cali wrote: >>> Sometimes when I run CPU intensive applications the system will >>> crash at seemingly unpredictable times, I have to hard reset the =20 >>> machine as it >>> is completely unresponsive, I was running an experiment in console =20 >>> mode and it showed me the kernel panic: >=20 >> With those uptimes I would say your heat sink and fan(hsf) is to =20 >> blame. The old idea about amds running hot is kind of crap, any cpu =20 >> will run hot if not installed correctly or overclocked. You got =20 >> that white stuff between the cpu and hsf? >=20 > I think I recall putting the white stuff in. >=20 >> I checked your hsf on the net and in silent mode it does not support =20 >> your cpu speed, though it does in normal higher speed fan mode. If =20 >> you have the fan make sure to keep it in normal mode or it may bake =20 >> your cpu! =20 >> http://www.zalman.co.kr/eng/product/view.asp?idx=3D33&code=3D005009010 >=20 > Damn! I should have researched this properly when I bought the =20 > heatsink. Thanks for that information, I'm lucky that you noticed =20 > this. >=20 >> Try this command several times after you boot. Then after you boot =20 >> your box do it while under load. >=20 >> sysctl -a|grep thermal >=20 >> That will tell you your cpu temp, you'll need acpi on. If you did =20 >> not put the hsf on right it will go up and you get problems like =20 >> after 5 minutes or less. I set my bios heat alarm to go off and =20 >> set a shutdown temp too. You might want to check that stuff out in =20 >> your bios too. Go to amd.com and get that pdf on how to install =20 >> the hsf, I made a mistake a month ago when I was switching out cpus =20 >> and that was my problem. >=20 >> Everything else looks good, but do you have some case fans? >=20 > OK, I think I had better invest in some, or some better cooling. >=20 >> I moved a 120mm fan over near my cpu and my 100% load temp while =20 >> folding droped about 10C. I am overclocked and it was maxing out =20 >> at about 58C or less. Now it hardly hits 50C, usaully 48C but it =20 >> might go down to 45C if it is cool in my room. I wonder how it =20 >> will do in the summer? :) >=20 > I used that sysctl command you suggested above and it says 55C-55.5C =20 > -- this is for when running underclocked. >=20 > I rebooted, put the CPU speed back to normal, left the fan on its =20 > dangerously low setting and then ran the program again, whilst =20 > checking the cpu temperature every second with: >=20 > while [ 1 ]; do sysctl -a | grep thermal; sleep 1; done >=20 > I observed the CPU temperature rise from a base of 50C at an =20 > approximately steady rate (I should have taken periodic readings too =20 > then I could have made a graph or something). It slowed down at about =20 > 57C (having took about 3-4 minutes to get there) or so but carried on =20 > rising, 58C...58.5C...59C...59.5C... kernel trap 11m33s =20 > (unfortunately I was setting up another process to run on another =20 > console so I never saw the final temperature). >=20 > This was with CPU thermal throttling enabled and set to 50% in my =20 > bios (although I'm not sure at which temperature it enables as it =20 > doesn't seem to say) >=20 > I turned the fan up to max, rebooted and ran the program again. The =20 > temperature seemed to stabilise around 52C. >=20 > Given this information I think it is highly likely that the =20 > temperature hypothesis is correct, and the reason for the crashing. >=20 > Thanks >=20 > cali >=20 >=20 > At 60C it is supposed to throttle, but I think it just crashes. I =20 think if you put an air duct next to your cpu that runs to a blow hole =20 with a big fan you will get real low temps. The big fan should be =20 sucking air out of the case if you do this. Make sure the hsf is mounted in the proper direction too, or it won't =20 work. If the air leaving your psu is hot you know you need better case =20 cooling. It should be warm, not hot. Glad I could help.
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