502601a540
Prior to this change we triggered ARC reclaim when kmem usage passed 3/4 of the total available, as indicated by vmem_size(kmem_arena, VMEM_ALLOC). This could lead large amounts of unused RAM e.g. on a 192GB machine with ARC the only major RAM consumer, 40GB of RAM would remain unused. The old method has also been seen to result in extreme RAM usage under certain loads, causing poor performance and stalls. We now trigger ARC reclaim when the number of free pages drops below the value defined by the new sysctl vfs.zfs.arc_free_target, which defaults to the value of vm.v_free_target. Credit to Karl Denninger for the original patch on which this update was based. PR: 191510 and 187594 Tested by: dteske MFC after: 1 week Relnotes: yes Sponsored by: Multiplay |
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