When the old code is disabled the ext4 driver takes over and does a better job and gives a smaller kernel. Specifically the ext4 driver does a better job of resisting fragmentation since it uses delayed allocation, and supports online resize, whereas the ext2 driver does not.
When the old code is disabled the ext4 driver takes over and does a better job and gives a smaller kernel. Specifically the ext4 driver does a better job of resisting fragmentation since it uses delayed allocation, and supports online resize, whereas the ext2 driver does not.