linux server optimization

Tricks to optimize linux server :

1. increase realpath_cache_size (default 16k) to 128k(1M)
2. optimize include_path variable for speedy search or use full path filenames
3. exclude from /etc/updatedb.conf  unneed path: large directories, many small files (uploads, users photos etc..)
4. if you use ispmanager, directadmin disable awstats, webalizer
5. use tmpfs for tmp/seesion directory
6. xcache/apc
7. mysqltuner.pl
8. put mysql datadir and php files on different disks
9. sysctl swappiness
10. mount options: noatime (order, barrier ?)