[Gllug] Pentium D frequency scaling

[Adrian McMenamin]

On Thu, 2011-03-31 at 17:39 +0100, Kostas Georgiou wrote:
> Broken ondemand scheduler in Linux 2.6.30+ on Pentium IVs

>From LKML:

p4-clockmod is NOT true CPU frequency scaling, it just forces the CPU
to 
idle on a periodic duty cycle and has no effect on CPU frequency. The 
clock modulation feature is basically just engaging the same mechanism 
the CPU uses to reduce heat output when it gets too hot, and which is 
not meant as a power saving mechanism. When engaged, it does reduce
heat 
output and power usage, but not as much as it reduces system 
performance, and means the system will simply take longer to return to 
idle. In short, using p4-clockmod can only increase power usage in any 
real workload. 

----

oh well

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