How BogoMIPS is calculated on SMP Linux Systems?

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I worked on Linux kernel to implement Symmetric Multi Processing support for one ARM SoC. When Kernel was running as Uniprocessor, the BogoMIPS value was 1171. But when I turned on SMP support in Linux kernel, BogoMIPS value decreased drastically to 17. So how this value is calculated and what are the factors affecting it?

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