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   Linux FAQ > 9. Miscellaneous Information and Questions Answered
Question:  9.6. What is a BogoMip?
Answer:

"BogoMips" is a combination of Bogus and Mips. MIPS stands for (depending on who you ask) Millions of Instructions per Second, or Meaningless Indication of Processor Speed.

The number printed at boot time is the result of a kernel timing calibration, used for very short delay loops by some device drivers.

According to the BogoMips mini-HOWTO, the rating for your machine will be:

              Common BogoMips Ratings
   Processor              BogoMips         Comparison
   Intel 8088             clock * 0.004    0.02
   Intel/AMD 386SX        clock * 0.14     0.8
   Intel/AMD 386DX        clock * 0.18     1 (definition)
   Motorola 68030         clock * 0.25     1.4
   Cyrix/IBM 486          clock * 0.34     1.8
   Intel Pentium          clock * 0.40     2.2
   Intel 486              clock * 0.50     2.8
   AMD 5x86           clock * 0.50     2.8
   Mips R4000/R4400       clock * 0.50     2.8
   Nexgen Nx586           clock * 0.75     4.2
   PowerPC 601            clock * 0.84     4.7
   Alpha 21064/21064A         clock * 0.99     5.5
   Alpha 21066/21066A         clock * 0.99     5.5
   Alpha 21164/21164A         clock * 0.99     5.5
   Intel Pentium Pro          clock * 0.99     5.5
   Cyrix 5x86/6x86        clock * 1.00     5.6
   Intel Pentium II/III       clock * 1.00     5.6
   Intel Celeron          clock * 1.00     5.6
   Mips R4600             clock * 1.00     5.6
   Alpha 21264            clock * 1.99     11.1
   AMD K5/K6/K6-2/K6-III      clock * 2.00     11.1
   UltraSparc II          clock * 2.00     11.1
   Pentium MMX            clock * 2.00     11.1
   PowerPC 604/604e/750       clock * 2.00     11.1
   Motorola 68060         clock * 2.01     11.2
   Motorola 68040         Not enough data (yet).
   AMD Athlon             Not enough data (yet).
   IBM S390           Not enough data (yet).


If the number is wildly lower, you may have the Turbo button or CPU speed set incorrectly, or have some kind of caching problem (as described in ("When Adding More Memory, the System Slows to a Crawl.")

For values people have seen with other, rarer, chips, or to calculate your own BogoMips rating, please refer to the BogoMips Mini-HOWTO, on ftp://metalab.unc.edu/. ("Where Is the Documentation?")

[Wim van Dorst]


This FAQ is from Linux Frequently Asked Questions with Answers, maintained by Robert Kiesling

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