Computer gets really hot under Linux

When I'm in Linux, even just idling, I can hear the fans of my Pentium 4 (yes, it's a shitty processor, but that isn't the point) working overtime to where they sound like a vacuum.

The only time it does this in Windows is when I have Oblivion or SimCity 4 running for about an hour.

I even have my Linux kernel dynamically-throttle my CPU speed such that Linux only turns up the frequency when a program is running that needs more computing power (I believe this is the CPUFreq series of settings in the kernel setup), and even when the cpufreq is a mere 400mhz, the fans are spinning as if the CPU is going at full 3.2ghz.

What can I do to prevent Linux from making my computer into a sauna-creation machine all the time?

In before "delete Linux and your shitty Pentium 4"

It's a problem with some process constantly waking the kernel. Unless you know how to find which process is causing this, I'm not sure how you can fix this problem yourself. There is work being done to make Linux and some programs less demanding so maybe the problem is fixed in the future.