Set zfs_arc_meta_strategy to metadata only
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Authored by vangyzen on Sep 13 2018, 4:58 PM.

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rS338656: Set zfs_arc_meta_strategy to metadata only

Summary

The previous default of "balanced" appears to have caused pathological
behavior, including very poor performance and 100% CPU load in the
arc_reclaim_thread.

Test Plan

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.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

vangyzen created this revision.Sep 13 2018, 4:58 PM

Herald added subscribers: dab, badger, delphij, imp. · View Herald TranscriptSep 13 2018, 4:58 PM

Harbormaster completed remote builds in B19572: Diff 48010.Sep 13 2018, 4:58 PM

To be clear, the motivation for this change is that 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.

This revision is now accepted and ready to land.Sep 13 2018, 5:06 PM

Closed by commit rS338656: Set zfs_arc_meta_strategy to metadata only (authored by vangyzen). · Explain WhySep 13 2018, 5:57 PM

This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

Path

Size

head/

sys/

cddl/

contrib/

opensolaris/

uts/

common/

fs/

zfs/

arc.c

7 lines

Diff 48011

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head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c

Set zfs_arc_meta_strategy to metadata onlyClosedPublicActions