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87b46d63b2
Since we use two B-trees q_exts_by_size and q_exts_by_addr, we should count 2x sizeof (range_seg_gap_t) per node. And since average B-tree memory efficiency is about 75%, we should increase it to 3x. Previous code under-counted up to 30% of the memory usage. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13537