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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/