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Date:      Wed, 24 Jun 2009 17:58:11 +1000
From:      Peter Jeremy <peterjeremy@optushome.com.au>
To:        Nirmal Thacker <thacker.nirmal@gmail.com>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Dump Utility cache efficiency analysis
Message-ID:  <20090624075811.GA463@server.vk2pj.dyndns.org>
In-Reply-To: <87429ffe0906231252j7c84489dt6ebd60333654f411@mail.gmail.com>
References:  <87429ffe0906231252j7c84489dt6ebd60333654f411@mail.gmail.com>

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On 2009-Jun-23 15:52:04 -0400, Nirmal Thacker <thacker.nirmal@gmail.com> wr=
ote:
>I would first like to understand the opinions of anyone who has looked at
>this problem or think this would be a worthwhile project to start off with.

I'm aware of the following references:
http://www.mavetju.org/mail/view_message.php?list=3Dfreebsd-hackers&id=3D37=
5676
http://www.mavetju.org/mail/view_thread.php?list=3Dfreebsd-stable&id=3D1335=
519&thread=3Dyes

>1. Installing a stable FreeBSD build
>2. Check out a version of the Build suitable for the project

Any changes will need to apply to FreeBSD -current, though they may be
back-ported once tested.  This means that you will need a -current
system at some point.  8-current is reasonably stable at this point and
would be my suggestion.

>3. Pointers to begin studying the current implementation in the code-tree
>structure (would I expect it to lie in the fs/ directory?). I tried to find
>it in the FreeBSD cross reference (http://fxr.watson.org/)

The code is in src/sbin/dump.  It references various system header
files in order to understand the UFS on-disk format.

>Lastly- does this project require the know-how's of device drivers? If so,=
 I
>would have to work harder.

No.  Dump is completely userland.

--=20
Peter Jeremy

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