Clarification on the DVFS capabilities

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Hi,

I have few doubts on the DVFS capabilities of my intel Core2Duo
processor (T5750) which has 2 cores (no hyperthreading) and has
Enhanced Intel Speed Step Technology (EIST). When I run the
"cpufreq-info" command in Ubuntu Linux I get the result that: "CPUs
which run at the same hardware frequency: 0 1". Hence I assumed that
both the CPUs will increase and decrease the frequency in a
synchronous fashion.

But when I tried to verify it by using the below command:

$ watch -n 0.1 grep \"cpu MHz\" /proc/cpuinfo

Here I see that each core is varying the frequency individually
contrary to the cpufreq-info commands output that both run at the same
hardware frequency. Hence can anyone comment on this behavior?

Regards,
karthik
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