On Mon, Jul 27, 2015 at 3:11 PM, Ming Lin <mlin@xxxxxxxxxx> wrote: > It's more interesting if we look at how many bios are allocated for each > application IO request. > > e.g. 10+2 RAID6 with 128K chunk. > > Assume we only consider device max_segments limitation. > > # cat /sys/block/md0/queue/max_segments > 126 > > So blk_queue_split() will split the bio if its size > 126 pages(504K > bytes). Fix myself. I mean, blk_queue_split() will split the bio if bi_phys_segments > 126 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
