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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <6934efce0808221104w1609bea8mbbff54019c261d80@mail.gmail.com>
Date:	Fri, 22 Aug 2008 11:04:08 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	"Jörn Engel" <joern@...fs.org>
Cc:	"Phillip Lougher" <phillip@...gher.demon.co.uk>,
	"Arnd Bergmann" <arnd@...db.de>, 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

> 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/