Hi Ron,
Throttling is meant as a last line of defense before powering-off
machine, and not a thermal regulation feature.
Please check if you have cpufreq compiled in and able to change frequency.
Please open a bug report at bugzilla.kernel.org against ACPI/Thermal.
Please attach dmesg output and 'grep . /proc/acpi/thermal/*/*'
Thanks,
Alex.
Ron Rechenmacher wrote:
Hi,
I believe I am having a critical thermal problem. I do not know if it
is limited to the 2.6.24.2 kernel which I am running. I do see there
has been some discussion about thermal zones and throttling on the
list, but I can not tell if it means that thermal throttling is not
working in 2.6.24.2
When I try to build several kernel source rpms, my dell d830 laptop
seems to over heat and hang. It's happened 3 times now and I would
like to learn what's going on and not let it happen again.
I'm a newbie (and have had problems trying to post :), so I do
apologize if I've missing something relatively simple or if this is
post is not appropriate in any way.
I'm running a Scientific Linux 5 (based on RHEL5) distribution and am
just running a cpuspeed user space utility --- and therefor do not
believe I have any user space process watching temperature. However,
in the earlier kernels, I use to be able to (manually) write to
/proc/acpi/processor/CPU0/throttling and see a change when read back,
but now the write does not seem to do anything. This might be OK as I
'm thinking the kernel and/or the hardware itself might now suppose to
be doing the throttling?
Anyway, in 3 windows, I run:
win1: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 180s
win2: while sleep 1;do cat /proc/acpi/thermal_zone/THM/temperature;done
win3: tail -f /var/log/messages
win4; while sleep 1;do cat /proc/acpi/processor/CPU0/throttling;done
In win2, I see the temperature go from 50 C to over 86 C.
In win3, before, the temp in win2 reaches 70 C, I see "kernel: CPU0:
Temperature/speed normal" (and also CPU1) and "kernel: Machine check
events logged"
The temperature would probably just continue to climb if I ran the
test for longer that 180 seconds (the kernel rpms take much longer and
do not complete before the system hangs :(
In /var/log/mcelog, (running mcelog-0.8pre), I only see "Processor
core below trip temperature. Throttling disabled" messages. This is
strange because it seems to be being disabling after never being
enabled. (Is there a newer mcelog I should be running?)
The fan speed does increase, but the throttling state indication never
changes (it's always "T0: 100%"). It seems that when I build the
kernel rpms, the increased fan speed is not enough to keep the
temperature form running away. It seems that thermal throttling would
be required and is not happening.
Should I be doing something from user space? Can I do something from
user space?
Thanks,
Ron
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