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rbd: set io_min, io_opt and discard_granularity to alloc_size

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Now that we have alloc_size that controls our discard behavior, it
doesn't make sense to have these set to object (set) size.  alloc_size
defaults to 64k, but because discard_granularity is likely 4M, only
ranges that are equal to or bigger than 4M can be considered during
fstrim.  A smaller io_min is also more likely to be met, resulting in
fewer deferred writes on bluestore OSDs.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
This commit is contained in:
Ilya Dryomov 2019-03-15 14:50:04 +01:00
parent 9e98c678c2
commit 16d80c54ad
1 changed files with 4 additions and 4 deletions
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8
drivers/block/rbd.c
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@ -833,7 +833,7 @@ static int parse_rbd_opts_token(char *c, void *private)
pctx->opts->queue_depth = intval;
break;
case Opt_alloc_size:
if (intval < 1) {
if (intval < SECTOR_SIZE) {
pr_err("alloc_size out of range\n");
return -EINVAL;
}
@ -4203,12 +4203,12 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
q->limits.max_sectors = queue_max_hw_sectors(q);
blk_queue_max_segments(q, USHRT_MAX);
blk_queue_max_segment_size(q, UINT_MAX);
blk_queue_io_min(q, objset_bytes);
blk_queue_io_opt(q, objset_bytes);
blk_queue_io_min(q, rbd_dev->opts->alloc_size);
blk_queue_io_opt(q, rbd_dev->opts->alloc_size);
if (rbd_dev->opts->trim) {
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
q->limits.discard_granularity = objset_bytes;
q->limits.discard_granularity = rbd_dev->opts->alloc_size;
blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT);
blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT);
}