linux-kernel - Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)

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Message-ID: <20080116115144.GE22460@elf.ucw.cz>
Date:	Wed, 16 Jan 2008 12:51:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	Daniel Phillips <phillips@...gle.com>
Cc:	David Chinner <dgc@....com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>, Al Boldi <a1426z@...ab.com>,
	Valerie Henson <val.henson@...il.com>,
	Rik van Riel <riel@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental
	fsck)

On Tue 2008-01-15 18:44:26, Daniel Phillips wrote:
> On Jan 15, 2008 6:07 PM, Pavel Machek <pavel@....cz> wrote:
> > I had write cache enabled on my main computer. Oops. I guess that
> > means we do need better documentation.
> 
> Writeback cache on disk in iteself is not bad, it only gets bad if the
> disk is not engineered to save all its dirty cache on power loss,
> using the disk motor as a generator or alternatively a small battery.
> It would be awfully nice to know which brands fail here, if any,
> because writeback cache is a big performance booster.

Is it?

I guess I should try to measure it. (Linux already does writeback
caching, with 2GB of memory. I wonder how important disks's 2MB of
cache can be).
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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