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14.3.16. BogoMIPS Value too low

Question:
We are only seeing 263.78 bogomips on a MPC5200 running at 396 MHz.
Doesn't this seem way to low ?? With a 603e core I'd expect 1 bogomip per MHz or better.

Answer:
No, the values you see is correct. Please keep in mind that there is a good reason for the name BogoMIPS.

On Power Architecture, the bogomips calculation is measuring the speed of a dbnz instruction. On some processors like the MPC8xx it takes 2 clocks per dbnz instruction, and you get 1 BogoMIP/MHz. The MPC5200 takes 3 clocks per dbnz in this loop, so you get .67 BogoMIP/MHz.

See also The frequently asked questions about BogoMips.
14.3.15. How to switch off the screen saver and the blinking cursor? 1. Abstract 14.3.17. Linux Kernel crashes when using a ramdisk image
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