From 9ad1a74ff0090fb201ee87ebb00b38c8bf25b26c Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Thu, 16 Jun 2022 13:19:45 -0600 Subject: [PATCH] md/raid5: Increase restriction on max segments per request The block layer defaults the maximum segments to 128, which means requests tend to get split around the 512KB depending on how many pages can be merged. There's no such restriction in the raid5 code so increase the limit to USHRT_MAX so that larger requests can be sent as one. Signed-off-by: Logan Gunthorpe Signed-off-by: Song Liu Signed-off-by: Jens Axboe --- drivers/md/raid5.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 651a84bf1a13..00cab9e525f1 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -8008,6 +8008,9 @@ static int raid5_run(struct mddev *mddev) */ blk_queue_max_hw_sectors(mddev->queue, RAID5_MAX_REQ_STRIPES << RAID5_STRIPE_SHIFT(conf)); + + /* No restrictions on the number of segments in the request */ + blk_queue_max_segments(mddev->queue, USHRT_MAX); } if (log_init(conf, journal_dev, raid5_has_ppl(conf))) -- 2.11.0