Dear folks, Hoping all are doing good. *Issue*:- Slowness in fsync() *System details*:- OS:- CentOS Linux *7.4* Linux Kernel:- *3.10.0-514 x86-64* File system:- *XFS* One of my module *(C/C++)* is writing to log files and periodically flushes it using *fsync()*. Even for small amount of data, *fsync* is taking more time *(>15 seconds)* than expected. Consequently, the main process was timed-out and got killed. Confirmed the slowness through strace. Observed the same behavior with *fsync* alternatives - *fdatasync & syncfs *as well *. *The odd thing is even with very very minimal disk I/O, same issue is happening. Did anybody face the issue ? I saw in this forum that performance improvements with respect to *fysnc* has already been made in file systems *ext2, ext3, brtfs* and *f2fs *in latest Kernels. I saw a similar improvement in quite old Kernel *(2.6.34)* for *XFS*. But, I didn't see any such improvements *(for XFS)* in *newer Kernels*. Should I need to downgrade my Kernel and observe the issue ? I fear that downgrading may lead to other performance issues. Is there a patch being planned in latest Kernel for CentOS ? Looking forward to hear back from you all. Thanks, Jeno