bcachefs: Increase BSET_CACHELINE to 256 bytes

Linear searches have gotten cheaper relative to binary searches on
modern hardware, due to better branch prediction behaviour.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/bset.h

@@ -188,7 +188,7 @@ static inline enum bset_aux_tree_type bset_aux_tree_type(const struct bset_tree
  * gets to the second cacheline.
  */
 
-#define BSET_CACHELINE		128
+#define BSET_CACHELINE		256
 
 static inline size_t btree_keys_cachelines(const struct btree *b)
 {