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bcachefs: Slightly reduce btree split threshold

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2/3rds performs a lot better than 3/4ths on the tested workloda, leading
to significanly fewer btree node compactions.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Kent Overstreet 2020-04-11 12:31:16 -04:00 committed by Kent Overstreet
parent 15a07f2eae
commit f270667a7f
1 changed files with 1 additions and 1 deletions
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2
fs/bcachefs/btree_cache.h
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@ -94,7 +94,7 @@ static inline unsigned btree_blocks(struct bch_fs *c)
return c->opts.btree_node_size >> c->block_bits; return c->opts.btree_node_size >> c->block_bits;
} }
#define BTREE_SPLIT_THRESHOLD(c) (btree_max_u64s(c) * 3 / 4) #define BTREE_SPLIT_THRESHOLD(c) (btree_max_u64s(c) * 2 / 3)
#define BTREE_FOREGROUND_MERGE_THRESHOLD(c) (btree_max_u64s(c) * 1 / 3) #define BTREE_FOREGROUND_MERGE_THRESHOLD(c) (btree_max_u64s(c) * 1 / 3)
#define BTREE_FOREGROUND_MERGE_HYSTERESIS(c) \ #define BTREE_FOREGROUND_MERGE_HYSTERESIS(c) \