My computer keeps crashing
calculus at softhome.net
Fri Jan 21 01:41:42 PST 2005
>> 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!
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
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
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.
More information about the freebsd-questions