Bug#757844: [akonadi-server] File system cache is inneficient: too many file per directory

[bastien ROUCARIES <roucaries.bastien@gmail.com>]

Package: akonadi-server
Version: 1.12.1-1+b1
Severity: important

~/.local/share/akonadi/file_db_data/ is completly inneficient and render the whole system slow.

Directory shoud not store more than  a thousand of entry. With my multi gigabyte mail box I have more than 900000 entry in this directory.

See http://etutorials.org/Server+Administration/Squid.+The+definitive+guide/Chapter+7.+Disk+Cache+Basics/7.1+The+cache_dir+Directive/ 
paragraph 7.1.4 L1 and L2 for how to do.

thumbnail cache, git and squid use this technique.

I am tented to raise to RC severity because some filesystem does not support this insane number of file per directory.

Bastien