From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [PATCH] LogFS take three
Date: Wed, 16 May 2007 13:25:48 +0100
Message-ID: <20070516122548.GA25239@mail.shareable.org>
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Cc: akpm@osdl.org, Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
	Albert Cahalan <acahalan@gmail.com>, John Stoffel <john@stoffel.org>,
	=?iso-8859-1?Q?J=F6rn?= Engel <joern@lazybastard.org>,
	linux-kernel@vger.kernel.org, Ingo Oeser <ioe-lkml@rameria.de>,
	Pekka Enberg <penberg@cs.helsinki.fi>, linux-mtd@lists.infradead.org,
	Jan Engelhardt <jengelh@linux01.gwdg.de>,
	Greg KH <greg@kroah.com>, linux-fsdevel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>, David Woodhouse <dwmw2@infradead.org>
To: Artem Bityutskiy <dedekind@infradead.org>
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Artem Bityutskiy wrote:
> On Wed, 2007-05-16 at 12:34 +0100, Jamie Lokier wrote:
> > J=F6rn Engel wrote:
> > > On Wed, 16 May 2007 12:54:14 +0800, David Woodhouse wrote:
> > > > Personally I'd just go for 'JFFS3'. After all, it has a better clai=
m to
> > > > the name than either of its predecessors :)
> > > =

> > > Did you ever see akpm's facial expression when he tried to pronounce
> > > "JFFS2"?  ;)
> > =

> > JFFS3 is a good, meaningful name to anyone familiar with JFFS2.
> > =

> > But if akpm can't pronounce it, how about FFFS for faster flash
> > filesystem.... ;-)
> =

> The problem is that JFFS2 will always be faster in terms of I/O speed
> anyway, just because it does not have to maintain on-flash indexing
> data structures. But yes, it is slow in mount and in building big
> inodes, so the "faster" is confusing.

Is LogFS really slower than JFFS2 in practice?

I would have guessed reads to be a similar speed, tree updates to be a
similar speed  to journal  updates for sustained  non-fsyncing writes,
and the difference unimportant for tiny individual commits whose index
updates are not merged with any other.  I've not thought about it much
though.

-- Jamie

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