Now this is interesting:

If the tools that come with openSUSE 11.2 are right, then on my AMD 
Phenom QuadCore box single-threaded apps (e.g. MegaPOV or MCPov ;-)) 
perform doubly poor (or actually something around 6.5-fold): Not only do 
they use just 25% of the total available processing power - by their 
failure to do so they also motivate some instance in the system to 
further reduce that total, by throttling the CPU clock from 2.3 GHz to 
as low as 1.4 GHz (actually 1.15 GHz when idle)...

Does someone have an idea whether this is controlled by the OS or by the 
CPU itself - and where I could turn it off?

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