linux-kernel - Re: [PATCH 04/10] AXFS: axfs

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Message-ID: <20080822171959.GA30977@logfs.org>
Date:	Fri, 22 Aug 2008 19:19:59 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Phillip Lougher <phillip@...gher.demon.co.uk>
Cc:	Arnd Bergmann <arnd@...db.de>, jaredeh@...il.com,
	Linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	linux-mtd <linux-mtd@...ts.infradead.org>, tim.bird@...sony.com,
	cotte@...ibm.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 04/10] AXFS: axfs_inode.c

On Fri, 22 August 2008 18:08:51 +0100, Phillip Lougher wrote:
> 
> Squashfs stores significantly more metadata than cramfs.  Remember 
> cramfs has no support for filesystems > ~ 16Mbytes, no inode timestamps, 
> truncates uid/gids, no hard-links, no nlink counts, no hashed 
> directories,  no unique inode numbers.  If Squashfs didn't compress the 
> metadata it would be significantly larger than cramfs.

Elsewhere in this maze of threads Arnd claimed to have tested the
benefits of metadata compression - and it making little impact.

My guess is that it would make a large impact if metadata would be a
significant part of the filesystem image.  Usually metadata is close
enough to 0% to be mistaken for statistical noise.  So compressing it
makes a significant impact on an insignificant amount of data.

Jörn

-- 
One of my most productive days was throwing away 1000 lines of code.
-- Ken Thompson.
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