tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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md/raid5: set chunk_sectors to enable full stripe I/O splitting

Set chunk_sectors to the full stripe width (io_opt) so that the block
layer splits I/O at full stripe boundaries. This ensures that large
writes are aligned to full stripes, avoiding the read-modify-write
overhead that occurs with partial stripe writes in RAID-5/6.

When chunk_sectors is set, the block layer's bio splitting logic in
get_max_io_size() uses blk_boundary_sectors_left() to limit I/O size
to the boundary. This naturally aligns split bios to full stripe
boundaries, enabling more efficient full stripe writes.

Test results with 24-disk RAID5 (chunk_size=64k):
dd if=/dev/zero of=/dev/md0 bs=10M oflag=direct
Before: 461 MB/s
After: 520 MB/s (+12.8%)

Link: https://lore.kernel.org/linux-raid/20260223035834.3132498-1-yukuai@fnnas.com
Suggested-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yu Kuai <yukuai@fnnas.com>

Yu Kuai d51e1668 7d96f312

+1
+1
drivers/md/raid5.c
··· 7780 7780 lim.logical_block_size = mddev->logical_block_size; 7781 7781 lim.io_min = mddev->chunk_sectors << 9; 7782 7782 lim.io_opt = lim.io_min * (conf->raid_disks - conf->max_degraded); 7783 + lim.chunk_sectors = lim.io_opt >> 9; 7783 7784 lim.features |= BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE; 7784 7785 lim.discard_granularity = stripe; 7785 7786 lim.max_write_zeroes_sectors = 0;