Re: [PATCH 04/10] AXFS: axfs_inode.c

Jared Hulbert
2008-08-22T18:04:10Z

> 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.

Like I said early it depends on the value you assign to significant.
For a fs sizes I started designing to 16MB-64MB if you have to track a
whole bunch of 8Byte numbers for every symlink, dev node, inode, and
page. It adds up quickly to a couple of MB, that can translate to
lots of money. Even at only an extra $0.25 a system * 12Million units
= $3Million.