linux-ext4 - Re: [PATCH] mke2fs reserved_ratio default value is nonsensical

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Message-ID: <20110329160011.GB16888@bitwizard.nl>
Date:	Tue, 29 Mar 2011 18:00:11 +0200
From:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Theodore Tso <tytso@....edu>, Oren Elrad <elrad@...ndeis.edu>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] mke2fs reserved_ratio default value is nonsensical

On Tue, Mar 29, 2011 at 10:26:29AM -0500, Eric Sandeen wrote:
> I agree, it seems like at least a decent first step to make it
> more site/admin-configurable. 

If the filesystem developers (that's us on this mailing list) decide
that 5% is a good tradeoff between "wasted space" and "performance
when the FS fills up", I think we should leave it as it is. If 
users really want to fill up their fs to the rim, they can do so 
"as root". Or they can tune the fs. 

If you make it configurable, it becomes too easy to create a badly
performing filesystem. 

People who don't understand the reasons behind the "reserved for root"
percentage will then be tempted to change the default for their system
to zero, and later complain about the bad performance they are getting. 

	Roger. 

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