From: Adil Mujeeb <mujeeb.adil@gmail.com>
Subject: ext4: Used block count in df
Date: Thu, 7 Feb 2013 12:09:05 +0530
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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