From: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
To: "Gaëtan Podevijn" <gpodevij@gmail.com>, linux-ext4@vger.kernel.org
Subject: Re: Ext2 and ext4 preallocation / mballoc
Date: Sat, 06 Mar 2010 20:15:20 +0530 [thread overview]
Message-ID: <87ocj1se4f.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <dda2e1011002170746x6cad8cekee6dcb7079002e10@mail.gmail.com>
On Wed, 17 Feb 2010 16:46:19 +0100, Gaëtan Podevijn <gpodevij@gmail.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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prev parent reply other threads:[~2010-03-06 14:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-17 15:46 Ext2 and ext4 preallocation / mballoc Gaëtan Podevijn
2010-03-06 14:45 ` Aneesh Kumar K. V [this message]
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