Xeon(R) CPU X3220 wrong frequency reading??

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Hi,
 My CPU is Xeon(R) X3220  2.4Ghz, but linux userspace governor gives 900Mhz.
The strange problem is that sometimes userspace governor gives correct
reading(after a new boot).
Is it the processor frequency scaling problem or linux problem or bios problem?
(someone said it is bios, but I don't think so) .
 
linux : 2.6.36.2
bios revision: 1.1

Thanks.
wkq


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