5 ms·

Here is your barrier syscall: https://www.man7.org/linux/man-pages/man2/sync.2.html https://www.man7.org/linux/man-pages/man2/sync.2.html

• kragen 2y ago
  That flushes, just like the fsync() system call mentioned in Luu's post.
  • ryao 2y ago
    It actually writes dirty data and then flushes. That said, IO barriers in storage are typically synonymous with flushes. For example, the ext4 nobarrier mount option disables flushes.