Date: Thu, 13 Sep 2018 17:56:48 +0000 (UTC) From: Eric van Gyzen <vangyzen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338656 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201809131756.w8DHumQq055861@repo.freebsd.org>
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Author: vangyzen Date: Thu Sep 13 17:56:48 2018 New Revision: 338656 URL: https://svnweb.freebsd.org/changeset/base/338656 Log: Set zfs_arc_meta_strategy to metadata only The previous default of "balanced" appears to have caused pathological behavior, including very poor performance and 100% CPU load in the arc_reclaim_thread. The symptoms appeared when the daily periodic run started. With this change, the system--and the ARC in particular--behaved normally during a manual daily periodic run. From Mark Johnston: The port of the balanced strategy is incomplete, since arc_prune_async() is a no-op on FreeBSD. (This also seems to imply that r337653 is a no-op.) After 12 is branched we can port the remaining bits and consider changing the default back. Submitted by: markj (essentially) Reviewed by: markj Approved by: re (gjb) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D17156 Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Thu Sep 13 17:39:08 2018 (r338655) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Thu Sep 13 17:56:48 2018 (r338656) @@ -538,8 +538,13 @@ typedef struct arc_state { */ int zfs_arc_meta_prune = 10000; unsigned long zfs_arc_dnode_limit_percent = 10; -int zfs_arc_meta_strategy = ARC_STRATEGY_META_BALANCED; +int zfs_arc_meta_strategy = ARC_STRATEGY_META_ONLY; int zfs_arc_meta_adjust_restarts = 4096; + +SYSCTL_INT(_vfs_zfs, OID_AUTO, arc_meta_strategy, CTLFLAG_RWTUN, + &zfs_arc_meta_strategy, 0, + "ARC metadata reclamation strategy " + "(0 = metadata only, 1 = balance data and metadata)"); /* The 6 states: */ static arc_state_t ARC_anon;
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