linux-ext4 - ext4: Used block count in df

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Message-ID: <CANBXnM=H0ghqzQ5aJ_O+1C_sMJ850LQ9TOHLncOYkCKVSnUrAw@mail.gmail.com>
Date:	Thu, 7 Feb 2013 12:09:05 +0530
From:	Adil Mujeeb <mujeeb.adil@...il.com>
To:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: ext4: Used block count in df

Hi,

I have an observation on EXT4 filesystem. I created filesystem of size
1TB, 4TB, and 7TB and then checked the output of df command.

df command showed the number of 1KB blocks used. The result was:
1TB: 204056
4TB: 198680
7TB: 181784

I performed the same on XFS and the result was:
1TB: 32928
4TB: 32928
7TB: 33024

EXT4 result shows with increasing filesystem size, the number of used
blocks decreased. I dont have idea about low level implementation but
I am curious why it is so?

Thanks.

Regards,
Adil
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