how can we modify voltage on DVFS through Linux

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Hello,
I am working on DVFS capable CPU - Nehalem quad core and I need to modify the
CPU speed and voltage. I disabled cpuspeed service on my machine and modified
some piece of cpuspeed code, to change the frequency of all the CPUs the way I want.

I am curious whether the voltage gets increased and decreased in proportion to the
frequency, or can we control the voltage separately. I could not locate any /sys entries for voltage
only for frequency.

--
Regards,
Priya
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