linux-kernel - Re: [PATCH] LogFS take three

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Date:	Thu, 17 May 2007 14:05:21 +0200
From:	Jörn Engel <joern@...ybastard.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Dongjun Shin <djshin90@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, Albert Cahalan <acahalan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Greg KH <greg@...ah.com>, Ingo Oeser <ioe-lkml@...eria.de>
Subject: Re: [PATCH] LogFS take three

On Thu, 17 May 2007 16:43:59 +0800, David Woodhouse wrote:
> 
> > As I mentioned, some techniques like log-structured filesystem could
> > perform generally better on any kind of flash-based storage with FTL.
> > Although there are many kinds of FTL, it is commonly true that
> > it performs well under workload where sequential write is dominant.
> 
> Yes, it's certainly possible that we _could_ write a file system which
> is specifically targeted at FTL -- I was just wondering why anyone would
> _bother_ :)

Haven't you done that already?  JFFS2 write behaviour is the best-case
scenario for any FTL.  When the delta cache is finished, LogFS will be
pretty close to that as well.

Not sure if anyone would specifically target FTL.  Being well-suited for
those beasts is just a side-effect.

The FTL is still a net loss.  Without that FAT enabling layer a real
flash filesystem would be more efficient.

Jörn

-- 
Prosperity makes friends, adversity tries them.
-- Publilius Syrus
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