> On Tue, 10 Nov 1998, Oz Dror wrote:
>
> > Hi
> > I have a pentium-II 400Mhz and a pentium MMX 200Mhz
> > both have 400.59 bogomips
> > Why?
>
> SWAG (Silly Wild-Assed Guess):
>
> The memory is the same speed? Since Intel guesses wrong in the branch
> prediction, it must refetch the instruction residing at the address of the
> result of the branch from cache. The bottleneck is not CPU speed, it is
> the cache RAM. In other words, the CPU is sees a branch instruction coming
> and assumes that the resulting target of the branch will be ahead ... it
> does not expect that someone is going to be running a tight loop. It never
> even looks for that since it is so rare in real life. As a result, the
> next instruction is not in its prefetch store and it has to go out to
> external cache to get it ... again and again and again.
>
The memory is not the same. the P-II has 256M dimm (8nsec), the
P-I MMX has 128MB EDO (60nsec)
-Oz
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NAME Oz Dror, Los Angeles, California
EMAIL [EMAIL PROTECTED] <<Linux since 8/15/94>>
PHONE Fax (310) 474-3126
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