linux-kernel - Re: swap-prefetch: A smart way to make good use of idle resources (was: updatedb)

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Message-Id: <1185573974.2711.8.camel@laptopd505.fenrus.org>
Date:	Fri, 27 Jul 2007 15:06:14 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Indan Zupancic <indan@....nu>
Cc:	Al Boldi <a1426z@...ab.com>, linux-kernel@...r.kernel.org
Subject: Re: swap-prefetch:  A smart way to make good use of idle resources
	 (was: updatedb)

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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