On Mon, Jun 15, 2020 at 08:24:08PM -0700, harshad shirwadkar wrote: > After taking a closer look, I don't see chunk_sectors being accounted > for in the splitting code. If I understand correctly, the implementation > of chunk_sectors is such that it allows for one big IO to go through. > In other words, it tries to avoid the splitting code if possible. But, > it doesn't seem to guarantee that when an IO is split, it will be Please take a look at blk_max_size_offset() which is called by get_max_io_size() from blk_bio_segment_split(), which splits bio into chunk_sectors aligned bio. Also you may run IO trace on queue with chunk_sectors setup, and check if the splitted IO request is what you expected. Thanks, Ming
