[REF] Ext4 speed improvement with a safe mount option on /data
As I spend some time on studying Ext4 for the Galaxy S devices, working on Voodoo lagfix, and based on what I saw in mount logs it's possible that the performances could be increased without altering data integrity nor filesystem integrity in case of crash.
On /data, noauto_da_alloc is not used.
This option activates a sort of Ext3 emulation mode, which force sync on write close without sync.
It also comes with a speed penalty for SQLite writes, and is unneccessary when hardware barriers are enabled.
Barriers allow usage of delayed allocations without risk. Delayed allocations are the key to performance for modern filesystems.
mount -o remount,noauto_da_alloc /data /data
You can count on me to cook a kernel with this mount option as default
PS: this option is already used in Voodoo kernels for Galaxy S devices / has been chosen after extensive performance and reliability tests.