On 11/2/19 1:29 AM, Ming Lei wrote: > __blk_queue_split() may be a bit heavy for small block size(such as > 512B, or 4KB) IO, so introduce one flag to decide if this bio includes > multiple page. And only consider to try splitting this bio in case > that the multiple page flag is set. > > ~3% - 5% IOPS improvement can be observed on io_uring test over > null_blk(MQ), and the io_uring test code is from fio/t/io_uring.c > > bch_bio_map() should be the only one which doesn't use bio_add_page(), > so force to mark bio built via bch_bio_map() as MULTI_PAGE. > > RAID5 has similar usage too, however the bio is really single-page bio, > so not necessary to handle it. Thanks Ming, applied. -- Jens Axboe
