Hi, I used to run my application on ext3 on SSD and recently switched to ext4. However, my application sees performance regression. The root cause is, iosnoop shows that the workload includes a lot of fsync and every fsync does data IO and also jbd2 IO. While on ext3, it seldom does journal IO. Is there a way to tune ext4 to increase fsync performance? Say, by reducing jbd2 IO requests? Thanks, Colin
