Core 2 Duo frequency after throttling

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Core 2 Duo frequency after throttling

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My operating system is QNX, which does not have API to query cpu frequency after throttled. I had tried to throttle each core and read cpu tempeature by porting from Linux succeessfully.. However,thethrottled cpu frequencyreading from two methodscan not returncorrect values: (1) MSR_FSB_FREQ(0xcd) and MSR_IA32_EBL_CR_POWERON (0x2a), or (2)MSR_IA32_APERF and MSR_IA32_MPERF.

In order to read correctthrottled cpu frequency, which MSR register should I use?

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