about cpufreq on intel dual core processor
Hi, I have a simple question about cpufreq on intel dualcore processor.
if each core has six frequency levels, then should i change the frequency levels for both of the cores simultaneously or i can change them separately?
because the processor supports hyper threading techonogy, so there are fours cores in the linux system. then how should i treat the four cpu when i want to do the frequency scaling?
Thanks.
Ming
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Quoted 5 lines · M C
Hi, I have a simple question about cpufreq on intel dualcore processor.
if each core has six frequency levels, then should i change the frequency levels for both of the cores simultaneously or i can change them separately?
because the processor supports hyper threading techonogy, so there are fours cores in the linux system. then how should i treat the four cpu when i want to do the frequency scaling?
You are able to set different frequencies per core, however you only save power per-socket, so unless they're all ramped down, you won't be lowering the voltage of the socket if one core keeps the package busy.
Dave
Signature · 1 line
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Quoted 8 lines · On Wed, 22 Aug 2007 20:18:15 -0400 Dave Jones <[email protected]> wrote:
Quoted 7 lines · M C
Hi, I have a simple question about cpufreq on intel dualcore processor.
if each core has six frequency levels, then should i change the frequency levels for both of the cores simultaneously or i can change them separately?
Quoted 8 lines
Quoted 3 lines
because the processor supports hyper threading techonogy, so there are fours cores in the linux system. then how should i treat the four cpu when i want to do the frequency scaling?
You are able to set different frequencies per core, however you only save power per-socket, so unless they're all ramped down, you won't be lowering the voltage of the socket if one core keeps the package busy.
and in fact, both your cores will run at the same frequency (the maximum of the ones you set) anyway... they will NOT run at separate frequencies.