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40496514b8
When you are using large recordsizes in conjunction with raidz, with incompressible data, you can pretty reliably be making 21 MB allocations. Unfortunately, the fragmentation metric in ZFS considers any metaslabs with 16 MB free chunks completely unfragmented, so you can have a metaslab report 0% fragmented and be unable to satisfy an allocation. When using the segment-based metaslab weight, this is inconvenient; when using the space-based one, it can seriously degrade performance. We expand the fragmentation table to extend up to 512MB, and redefine the table size based on the actual table, rather than having a static define. We also tweak the one variable that depends on fragmentation directly. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Closes #16986 |
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