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We have a server which has four Intel Xeon E7 4860 CPU. Strangely, the model name in /proc/cpuinfo contains a 000 string instead of E4860.

Incorrect model name:

model name  : Genuine Intel(R) CPU             000  @ 2.27GHz

Correct model name:

model name  : Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz

The servers runs Arch Linux with kernel 3.2.12

BTW, I digged into kernel source code and found the relevant information are retrieved using Intel CPUID instruction.

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It might help you to search for "Linux kernel misdetects Intel Xeon as Genuine Intel" rather than focus on the /proc/cpuinfo API. –  j13r Apr 5 '12 at 14:33
    
Thanks! This is a MUCH better keywork to search –  yanglei Apr 5 '12 at 15:21
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2 Answers

Try the dmidecode command to compare results.

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no, dmidecode has the same result as /proc/cpuinfo –  yanglei Apr 5 '12 at 15:15
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How about the lshw command? Does that give you the model number?

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no, the result is same as /proc/cpuinfo. This is because lshw internally parse /proc/cpuinfo –  yanglei Apr 5 '12 at 15:18
    
you are right. i guess /dev/cpu/*/cpuid will be the same deal then. i wonder if it is a kernel bug or something with the hardware itself. what if you boot up a livecd/liveusb with a different distro or even different OS, say windows 7? –  johnshen64 Apr 5 '12 at 15:36
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