Yesterday, while doing a large build on an FC3 machine, I received many warnings from the kernel that the CPU clock speed was being adjusted due to the temperature beyond the threshhold. Considering the machine I was using (a Dell Precision Xeon box), I can certainly believe the warnings. I wonder, though, how the kernel knew the threshhold. My first thought was the info beneath /proc/acpi/, yet /proc/acpi/thermal_zone/ is empty. I then thought of cpuspeed, but the /etc/cpuspeed.conf file is just a sample and had only commented-out config parameters. So... how does the kernel know what the thermal threshhold is for a given system? Thanks.
