Re: why cpu MHz in /proc/cpuinfo different from model spec?

At Thu, 30 Oct 2008 17:27:00 -0700 (PDT) Bennett Haselton <bennett@xxxxxxxxxxxxx> wrote:


I lease a couple different dedicated servers with different hardware
specs. As far as I can tell, in /proc/cpuinfo , when it's an Intel
chip, the megahertz given in the model name agrees closely with the
actual value of "cpu MHz" reported:

model name : Intel(R) Celeron(R) CPU 2.80GHz
stepping : 9
cpu MHz : 2800.618
===
model name : Intel(R) Celeron(R) CPU 1.70GHz
stepping : 3
cpu MHz : 1717.057
===
model name : Intel(R) Celeron(R) D CPU 3.33GHz
stepping : 5
cpu MHz : 3330.268

The above is all 'round off error', mostly by the marketing dept. None
of Intel's processors since the days of the 80286 have simple integer
clock speeds in real life. They are all some odd fraction because of
multi-stepped clocks and other games. Don't worry about it.


but when it's an AMD chip, the reported cpu MHz is much less:

model name : AMD Athlon(tm) XP 2800+
stepping : 0
cpu MHz : 2125.300
===
model name : AMD Sempron(tm) 2500+
stepping : 1
cpu MHz : 1749.922
===
model name : AMD Sempron(tm) 2200+
stepping : 1
cpu MHz : 1494.263

I think the machines are mostly running CentOS. Has the evil
Microsoft/Intel conspiracy extended to engulf CentOS as well, so that
it's now deliberately reporting AMD chips as slower? :) Or is there a
simpler explanation.

-Bennett


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