Messages in this thread | | | Subject | Re: swap-prefetch: A smart way to make good use of idle resources (was: updatedb) | From | Arjan van de Ven <> | Date | Fri, 27 Jul 2007 15:06:14 -0700 |
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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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