[ELDK] Another BogoMIPS question

[Gao Ya'nan]

OK, I see.

As an embeded linux newbie, there are too many strange things for me,
so I have to be carefull. When I got the low BogoMIPS value, I tried
to find another one to check, and found that someone had get more than
49  BogoMIPS on MPC860, so here is the question.

Now, I booting the kernel sucessfully by trying and checking, but
failed to mount root filesystem. And I think I will know more and more
about Linux.

Thanks for your patience.

Gao Ya'nan

2009/9/9 Wolfgang Denk <wd at denx.de>:
> Dear "Gao Ya'nan",
>
> In message <d15e5cf90909081526r4f4becdcj349408c6df648792 at mail.gmail.com> you wrote:
>>
>> > 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.
>
> I don't have any 8xx systems running 2.6 Linux here; but the 875 is
> definitely different from the, say, 860.
>
>> 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.
>
> Of course it's true. The "Bogo" part in the "BogoMIPS" name has a good
> reason - it tries to make absolutley clear that this is a bogus value,
> a meaningless indication of processor speed.
>
>
> What I don't understand yet is - why do you care about that number?
> It's just a few bits without any impact on any application code?
>
> 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
> Human beings were created by water to transport it uphill.
>