From: Christoph Hellwig Date: Fri, 31 May 2024 07:22:13 +0000 (+0200) Subject: rbd: increase io_opt again X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=2175fd35d2e9944e010b89859e20c11964aa3d1a;p=users%2Fhch%2Fblock.git rbd: increase io_opt again Commit 16d80c54ad42 ("rbd: set io_min, io_opt and discard_granularity to alloc_size") lowered the io_opt size for rbd from objset_bytes which is 4MB for typical setup to alloc_size which is typically 64KB. The commit mostly talks about discard behavior and does mention io_min in passing. Reducing io_opt means reducing the readahead size, which seems counter-intuitive given that rbd currently abuses the user max_sectors setting to actually increase the I/O size. Switch back to the old setting to allow larger reads (the readahead size despite it's name actually limits the size of any buffered read) and to prepare for using io_opt in the max_sectors calculation and getting drivers out of the business of overriding the max_user_sectors value. Signed-off-by: Christoph Hellwig --- diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 26ff5cd2bf0a..46dc487ccc17 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -4955,8 +4955,8 @@ static int rbd_init_disk(struct rbd_device *rbd_dev) struct queue_limits lim = { .max_hw_sectors = objset_bytes >> SECTOR_SHIFT, .max_user_sectors = objset_bytes >> SECTOR_SHIFT, + .io_opt = objset_bytes, .io_min = rbd_dev->opts->alloc_size, - .io_opt = rbd_dev->opts->alloc_size, .max_segments = USHRT_MAX, .max_segment_size = UINT_MAX, };