I noticed this when sync'ing a folder with hundreds of thousands of sub folders from my local 32-bit Ubuntu (10.04, ext3) to my remote 64-bit (10.04 ext3) VPS.
The size of the local directory is hundreds of M's larger than that of the remote server.
It turns out that the difference is caused by the different sizes of the folders --
$ uname -a Linux <> 188.8.131.52-x86_64-<> #1 SMP Tue Jun 21 10:04:20 EDT 2011 x86_64 GNU/Linux $ ls -ld electronics/ drwxr-xr-x 12 jerry jerry 4096 2012-01-22 06:13 electronics/ $ uname -a Linux <> 2.6.32-37-generic #81-Ubuntu SMP Fri Dec 2 20:35:14 UTC 2011 i686 GNU/Linux $ ls -ld electronics/ drwxr-xr-x 12 jerry jerry 12288 2012-01-22 14:13 electronics/
The question is: Why are the folder sizes different? And when I install a new Ubuntu, how to make them as small as possible?