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[Bug-tar] High per file overhead?

From: Phillip Susi
Subject: [Bug-tar] High per file overhead?
Date: Fri, 24 Feb 2006 12:03:59 -0500
User-agent: Thunderbird 1.5 (Windows/20051201)

Can anyone explain this?

~$: du -bsh Maildir/
98M     Maildir/
~$: tar cf Maildir.tar Maildir/
~$: du -bsh Maildir.tar
112M    Maildir.tar
~$: find Maildir | cpio -o -H newc > Maildir.cpio
204433 blocks
~$: du -bsh Maildir.cpio
100M    Maildir.cpio

Why does tar have 12M more overhead than cpio? This Maildir is the lkml since Jan 1, so it contains ~20,000 messages/files, but ~734 bytes per file seems like a bit much for overhead.

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