about memory bandwidth

[zzh]

Hi,How to measure the 60x bus bandwidth.I write a program to write
to sdram in a tight loop,every iteration ,i write 8 words,
it takes about 36 seconds to finish 32M iterations with i-cache
enabled and d-cache disenabled.With d-cache enabled and flushing
 cache in every iteration,it takes about 16 seconds.This is below
what i speculated.What is the possible reason?I program the sdram
machine to enable burst mode.                            4/7/2000

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