[plug] CPU Performance Measure

[Alexander Hartner]

I am using the following command to fully saturate one core:

*dd if=/dev/zero of=/dev/null bs=4M count=500000

*The following results were achieved on different systems
*
**System A :
*Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz
6-cores - single chip
Turbo up to 3.80Ghz
OS: Gentoo 64bit 3.2.1-gentoo-r2
2097152000000 bytes (2.1 TB) copied, 100.911 s, *20.8 GB/s*

*System B :*
Intel(R) Xeon(R) CPU           X3470  @ 2.93GHz
4-cores - single chip
OS: Redhat 5.7 64 bit 2.6.18-308.el5
2097152000000 bytes (2.1 TB) copied, 80.6255 seconds, *26.0 GB/s*

To my understanding this test is not dependent on IO so disk performance
is out of the picture. My question is how can a 2-3 year old chip Xeon
X3470 (System B) running almost a whole Ghz slower then the i7 (System
A) produce a result which is so much better in comparison. Does this
indicate a problem on the i7 system ? Is there anything I can configure
/ check to improve the performance ?

Any thoughts
Alex
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