[clug] CPU speed in MHz

Scott Ferguson scott.ferguson.clug at gmail.com
Mon Nov 17 20:09:16 MST 2014

On 18/11/14 11:03, Eyal Lebedinsky wrote:
> On 11/18/14 10:56, Bryan Kilgallin wrote:
>> Yes thanks Eyal:
>>> There is no reliable way to extract the CPU MHz from the numbers here.
>> The phone seems to have very limited utility info.
>>> However, it
>>> is possible that this CPU has a known fixed speed (set by either the
>>> manufacturer
>>> or the board design). Check the relevant doco.
>>> For example, this doco (is this your phone?)
>>>     http://wiki.openmoko.org/wiki/Neo_FreeRunner_Hardware
>>> says "400/500 MHz", so I will assume the "BogoMIPS: 199.47" suggests
>>> 400MHz.
>> Yes, that's my phone. And I had read elsewhere that its model of CPU
>> ran at 400 MHz.
>> According to the BogoMIPS readouts, my PC is 28 times as fast as the
>> phone!
> Do not put too much trust in BogoMIPS, this does not represent the CPU
> MHz in a reliable
> way and neither reflect the true performance of a CPU.
> cheers

BogoMips (from "bogus" and MIPS) is an unscientific measurement of CPU
speed made by the Linux kernel when it boots to calibrate an internal
busy-loop. An oft-quoted definition of the term is "the number of
million times per second a processor can do absolutely nothing".

Kind regards

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