There is only 3 values affecting mostly affecting io perfomance.
noatime – don`t store file access time
Nodiratime – don`t store disk access time
And turn off journal!
tune2fs -O has_journal -o journal_data_writeback /dev/sdaX
or
data=writeback
my fstab
/dev/md/2 / ext4 noatime,nodiratime 0 0
But thereis no magic… if your have serious io problems – this will not help you. Tuning can give up to 10% perfomance.
usually less.
additional info
http://kerneltrap.org/node/14148
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