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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 <logang@deltatee.com>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Logan Gunthorpe 2022-06-16 13:19:45 -06:00 committed by Jens Axboe
parent df1b620a3e
commit 9ad1a74ff0
1 changed files with 3 additions and 0 deletions
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3
drivers/md/raid5.c
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@ -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)))