On Fri, 2007-07-27 at 23:51 +0200, Indan Zupanci
> > also, they take up seek time (5 to 10 msec), so if you were to read
> > something else at the time you get additional latency.
>
> If there's other disk activity swap prefetch shouldn't do much, so this isn't
> really true.
how do you know there will be other activity? You start the IO and that
basically blacks out the disk for 5 to 10 ms. If the "real" IO gets
submitted in that time you add latency. You cannot predict that IO
happening or not happening.
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