Hello, On Sat, 28 Jul 2012, Raymond Wooninck wrote:
I just wanted to check if I am the only one that has thermal issues with the 3.4 kernel ? I see the following behavior :
1) Load the notebook with a gcc acitivity until all processors are 100% load 2) Shortly after you get notifications that a thermal event is reached (CPU's > 100 degrees) 3) Kernel reacts and shutdown the system. [..] effect. Once the temperature gets to a certain point, the kernel lowers the speed of the CPU's to the lowest point.
Thermal throttling is done autonomously by the CPU. Anyway: up till a few days ago, I used the "boxed" Cooler/Fan Combo on my Athlon II X2 250 (2x3.0GHz). As the cooler wasn't sprinkly clean anymore but had gathered some dust, when running both cores 100% the CPU got to ~59°C (k10temp)/69°C (it8720 MoBo sensor) rather fast (cleaning the cooler a bit recently helped a bit, but not much), with the fan spinning at top speed of about 3200 min^-1. I've now changed to an "overspecced" Cooler/Fan (Scythe Shuriken Rev. B w/120mm Fan) and guess what: just today I ran both cores for hours at 100% and temps topped out at about 40°C/51°C (with a room temp of ~25°C!) and the fan spinning at a leisurely ~1300-1350 min^-1 (out of a ~500-2350 min^-1 range, controlled by "fancontrol"). Almost 20°C cooler, along with less noise? That was worth the expense of 24 EUR. :) Now, I just hear the 7 disks spinning (I also changed the case fan and the 8th disk for a SSD (Samsung SSD 830 128G, the 64G is half as fast, the 256G just a bit faster but much than twice as expensive. Makes for a snappy boot and me convert / to ext4 *g*)). But, as you have a notebook and are stuck with your cooling system, check up on dusted up coolers / vents etc. Carefully clean the fans. Google for how to (suck vs. blow). Anyway: having the CPU throttling itself on load is not "normal". Whether the load comes from cinebench, prime95, gcc, mencoder, folding@home, seti@home or whatever is irrelevant.
Once the CPU's are cool'ed down, this maximum speed should be increased again.
ACK. -dnh --
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