[PATCH 04/10] AXFS: axfs_inode.c
joern at logfs.org
Fri Aug 22 13:19:59 EDT 2008
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.
One of my most productive days was throwing away 1000 lines of code.
-- Ken Thompson.
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