Re: Memory mapped IO vs Port IO

[Martin J. Bligh]

>> Also - a perhaps more useful test is a write followed by a read.
> 
> Well, someone else will have to run that test.  On Altix, a read() is
> freakishly expensive, and I'm not really interested in showing everyone
> how bad it is ;)

I find percentile comparisons useful for hiding the embarassement
of occasional hardware realities ;-) (ie what's the speed *ratio*
between the two types of read).

M.

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