linux-kernel - Re: [PATCH 5/7] vfs: Add wbcflush sysfs knob to disable storage device writeback cache flushes

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Date:	Mon, 30 Mar 2009 17:14:08 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	chris.mason@...cle.com, david@...morbit.com, tj@...nel.org
Subject: Re: [PATCH 5/7] vfs: Add  wbcflush sysfs knob to disable storage device writeback cache flushes

On Monday 30 March 2009, Fernando Luis Vázquez Cao wrote:
> Add a sysfs knob to disable storage device writeback cache flushes.

The horde of casual desktop users (with me included) would probably prefer
having two settings -- one for filesystem barriers and one for fsync().

IOW I prefer higher performance at the cost of risking losing few last
seconds/minutes of work in case of crash / powerfailure but I would still
like to have the filesystem in the consistent state after such accident.

Thanks,
Bart
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