W dniu 2010-02-05 20:41, Phil Smith III pisze:
Answer from a knowledgeable IBMer:
The answer is yes, the z9 and z10 processors will go into "low power" mode when
not in use. On z9 this is on a chip basis, on z10 this is on a core basis (so the effect
is better). For z this effectively means those chips/cores which are not characterized
(i.e. spares).
As for the point that was made about the power rating not changing: that's
probably a nominal rating. It's OK to use less :-)
Power estimation tool on the web can be called nominal rating. Real
measurements cannot. Real measurements *shows* that activation of CPU
does not change power consumption in measurable way. Maybe some
processor parts are in low power mode, but overall is not affected by
the feature.
BTW: I really DON'T CARE whether CPUs in server has such feature or not.
This is the last place I would expect such feature. Power consumption of
mainframe is the last issue I would worry about. Even after weight and
floor space.
BTW2: As a conlusion, I have no interest to proving neither high nor low
power consumption. IBMers could have some demand to speak higly of
mainframe. However someone exaggerated a little: since BOTH z9 and z10
do have power saving facilities then why IBM said so much about "green"
z10?
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