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6a2f7b3844
Since we are calculating a free space fragmentation, we should weight metaslabs by the amount of their free space, not a full size. Fragmentation of full metaslabs may not matter in presence empty ones. The old algorithm did not differentiate metaslabs having only one free 4KB block from metaslabs having 50% of space free in 4KB blocks, reporting higher fragmentation. While there, move metaslab_group_alloc_update() call after setting mg_fragmentation, otherwise the effect may be delayed by one TXG. Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Reviewed-by: Paul Dagnelie <pcd@delphix.com> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> |
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