Date: Fri, 21 Jan 2005 09:41:45 -0000 From: "cali" <calculus@softhome.net> To: "Jason Henson" <jason@ec.rr.com>, <freebsd-questions@freebsd.org> Subject: Re: My computer keeps crashing Message-ID: <004801c4ff9d$6b9dab60$0501a8c0@SPECULUSHX1THE> References: <002801c4ff4d$0ad34880$0501a8c0@SPECULUSHX1THE> <1106283993l.49858l.4l@BARTON>
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>> Sometimes when I run CPU intensive applications the system will >> crash at seemingly unpredictable times, I have to hard reset the machine >> as it >> is completely unresponsive, I was running an experiment in console mode >> and it showed me the kernel panic: >With those uptimes I would say your heat sink and fan(hsf) is to blame. >The old idea about amds running hot is kind of crap, any cpu will run hot >if not installed correctly or overclocked. You got that white stuff >between the cpu and hsf? I think I recall putting the white stuff in. >I checked your hsf on the net and in silent mode it does not support your >cpu speed, though it does in normal higher speed fan mode. If you have >the fan make sure to keep it in normal mode or it may bake your cpu! >http://www.zalman.co.kr/eng/product/view.asp?idx=33&code=005009010 Damn! I should have researched this properly when I bought the heatsink. Thanks for that information, I'm lucky that you noticed this. >Try this command several times after you boot. Then after you boot your >box do it while under load. >sysctl -a|grep thermal >That will tell you your cpu temp, you'll need acpi on. If you did not put >the hsf on right it will go up and you get problems like after 5 minutes >or less. I set my bios heat alarm to go off and set a shutdown temp too. >You might want to check that stuff out in your bios too. Go to amd.com >and get that pdf on how to install the hsf, I made a mistake a month ago >when I was switching out cpus and that was my problem. >Everything else looks good, but do you have some case fans? OK, I think I had better invest in some, or some better cooling. > I moved a 120mm fan over near my cpu and my 100% load temp while folding > droped about 10C. I am overclocked and it was maxing out at about 58C or > less. Now it hardly hits 50C, usaully 48C but it might go down to 45C if > it is cool in my room. I wonder how it will do in the summer? :) I used that sysctl command you suggested above and it says 55C-55.5C -- this is for when running underclocked. I rebooted, put the CPU speed back to normal, left the fan on its dangerously low setting and then ran the program again, whilst checking the cpu temperature every second with: while [ 1 ]; do sysctl -a | grep thermal; sleep 1; done I observed the CPU temperature rise from a base of 50C at an approximately steady rate (I should have taken periodic readings too then I could have made a graph or something). It slowed down at about 57C (having took about 3-4 minutes to get there) or so but carried on rising, 58C...58.5C...59C...59.5C... kernel trap 11m33s (unfortunately I was setting up another process to run on another console so I never saw the final temperature). This was with CPU thermal throttling enabled and set to 50% in my bios (although I'm not sure at which temperature it enables as it doesn't seem to say) I turned the fan up to max, rebooted and ran the program again. The temperature seemed to stabilise around 52C. Given this information I think it is highly likely that the temperature hypothesis is correct, and the reason for the crashing. Thanks cali
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