linux-ext4 - Re: Ext2 and ext4 preallocation / mballoc

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Message-ID: <87ocj1se4f.fsf@linux.vnet.ibm.com>
Date:	Sat, 06 Mar 2010 20:15:20 +0530
From:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Gaëtan Podevijn <gpodevij@...il.com>,
	linux-ext4@...r.kernel.org
Subject: Re: Ext2 and ext4 preallocation / mballoc

On Wed, 17 Feb 2010 16:46:19 +0100, Gaëtan Podevijn <gpodevij@...il.com> wrote:
> Hello,
> 
> Reading this http://web.mit.edu/tytso/www/linux/ext2intro.html I
> understand that ext2 preallocates 8 blocks when a writing data to a
> file. Ext3 uses the windows reservations method, but is that ext3 also
> preallocates 8 blocks when writing data ?
> 
> Moreover, this page
> http://kernelnewbies.org/Ext4#head-b2148d2a96d22a1bd7e376e6c08e4a38d08fb157
> explains that ext3 allocates one block at a time and ext4 uses
> multiblock allocation that is, allocates many block in a single system
> call.
> 
> What is the difference between preallocation on ext2 (and ext3 ?) and mballoc ?
> 
> 


You can find mballoc details at 

http://ols.fedoraproject.org/OLS/Reprints-2008/kumar-reprint.pdf

-aneesh
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