BogoMips

BogoMip is used in the Linux kernel measure of the CPU speed. The value is determined at boot time to adjust an internal queue.

The name derives from the English bogus - fake, apparently - and the degree of ( millions ) instructions per second ( [ M] IPS) - ex. An often quoted definition is "The number of repetitions million per second, which is a processor able to do absolutely nothing ."

BogoMip is a value that is used to check whether the processor is in comparison to other processors of the same type in the ordinary performance specification. So BogoMip determines the clock frequency of a processor as well as the potentially present CPU cache. It is not suitable for a performance comparison between different CPUs.

1993 published Lars Wirzenius a mail in which he explained the need for the introduction of BogoMip the Linux kernel on comp.os.linux:

"MIPS is short for Millions of Instructions per Second. It is a measure of the calculation of a processor. As most of these measures, it is often misused as a right, because it is very difficult to compare MIPS for different types of computers to each other correctly. BogoMip are Linus Torvalds ' own invention. The Linux kernel version 0.99.11 ( 11 July 1993) took a while loop that had to be adapted to the clock speed of the processor, but the time is too short and / or have to be too accurate for inactive waiting. Therefore, the kernel measures at boot time how fast a certain kind of busy loop runs on a computer. " Bogo " comes from " bogus ", ie something that is fake. This BogoMip gives an indication of the processor speed, but it is much to be unscientific called to order unlike BogoMip. There are two reasons why it is displayed during the boot -up: a) because it is something useful for debugging, and to check whether the computer cache or the turbo button work, and b ) because Linus loves to chuckle when he sees if people are confused about the messages displayed. "

The BogoMip can be predicted with the following table.

The given review is for the CPU with the then-current and used Linux version. The index is the ratio of " BogoMip per clock speed " for each CPU in comparison with an Intel 386DX CPU and is used to compare with it.

( Each clock in MHz)