[ELDK] Another BogoMIPS question

[Gao Ya'nan]

2009/9/9 Wolfgang Denk <wd at denx.de>:
> Dear "Gao Ya'nan",
>
> In message <d15e5cf90909080705o1f9f2c48n3b72f03ffe3e3616 at mail.gmail.com> you wrote:
>> Sorry for asking BogoMIPS question, but I have read the FAQ in DULG.
>>
>> First I use U-Boot-v2009.08 and Linux-2.6.30.3, and only adopt some
>> necessary code for my MPC875 board from fads, don't change the
>> configuration related on clock.
>>
>> But when booting the Linux compiled with mpc885_ads_defconfig, I get
>> the BogoMIPS value is 6.19, though the processor is running on 50MHz.
>>
>> The PLPRCR value and whole message are below:
>
> OK, this is a description of you situation.
>
> And what is your question?

By the FAQ, I should get about 50 BogoMIPS when MPC875 runs on 50MHZ,
But now I get only 6 BogoMIPS. It's very strange.

And I search something from
http://ozlabs.org/pipermail/linuxppc-embedded/2008-November/031770.html,
and there is a result that the BogoMIPS value depends on the
decrementer frequency and is nonsense.

Is that true?

Thanks.

>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> "Open the pod bay doors, HAL."                    - Dave Bowman, 2001
>