Re: Memory mapped IO vs Port IO

Martin J. Bligh
2003-09-12T19:09:27Z

>> 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.