> Does anybody know what happens when you stash a huge number of tiny
> files in Ext4? Does it store them efficiently the way ReiserFS does?
No. Neither ext3 nor ext4 efficiently stores sub-block sized files.
The minimum files size granularity is the block size. The internal
fragmentation can hurt with many small files.
As others have mentioned, reiserfs handles that. However, I can't
recommend reiserfs unless extra effort is devoted to backups, since
catastrophic failures can result from the loss of a single block
in reiserfs. I have high hopes for btrfs, which appears to solve
these issues and more, but I haven't switched over to it yet.
-Dale
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