Hi, Based on what's going on in blk-mq & NVMe land I though I'd check if XFS still sorts buffers before sending them down the pipe, and sure enough that still happens in xfs_buf.c:xfs_buf_delwri_submit_buffers() (the comparson function is directly above). Before I make a fool of myself and try to remove this, do we still think this is necessary? If there's a scheduler it will do the same thing, and SSD/NVMe might do the same in HW anyway or not care. The only scenario I can think of where this might make a difference is rotational RAID without scheduler attached. Not sure. I'm looking forward to hear what a foolish idea this is. cheers Holger
