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Date:      Thu, 27 Feb 2003 16:20:45 -0000
From:      "Paul Robinson" <paul@iconoplex.co.uk>
To:        <hiten@unixdaemons.com>, <hackers@FreeBSD.ORG>
Subject:   RE: Disk scheduling in FreeBSD
Message-ID:  <IPEDKJGCDFHOPEFKLIDHIEPMCCAA.paul@iconoplex.co.uk>
In-Reply-To: <1046361700.3e5e3664bcf24@webmail.unixdaemons.com>

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Hiten Pandya wrote:

> Hello gang.
>
> Does anyone know what kind of `Disk Scheduling' algorithm,
> if any, is used in FreeBSD?

I'm assuming you've read this recently then:

http://www.kerneltrap.org/node-592.html

Anticipatory Schedulers are all well and good, but I think (I might be
corrected here) that most of the disk I/O work in FreeBSD has been around
softupdates. However, when I read it, and looked at a description of the AS
algo (not the source, I don't want to have any GPL infection around me), I
have to admit, I did eye up /usr/src and my week's holiday the week after
next, just as a bit of fun...

Anybody else got plans on this? I need to have a proper look around the
source tree, but I think this would be both self-contained (i.e. easy to
back out if it breaks) and useful. Quite a small-ish project really as well.


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