I create 10 fio simultaneously in my server and I found that clat attribute shows 50% and 95% has a 10 times difference.(each fio write 1GB file with 4KB blocksize with buffered IO)
That result maybe means later IO will cost much time than early IO.(Just guess) I lookup the generic_perform_write() and the following procedure like below: write_begin > prepare_write_begin > f2fs_wait_on_page_writeback > zero_segments write_end > set_page_dirty Is there any possible bottleneck in the above function? Does f2fs_wait_on_page_writeback always wait there? _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
