NAS-129533 / 24.04.3 / Tune ARC memory pressure parameters (by amotin) #13951
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- Setting zfs_arc_shrinker_limit=0 should make ARC more obedient to all kernel shrinker KPI requests, that should help to avoid OOMs. - zfs_arc_pc_percent=300 should prevent file-backed part of page cache from getting bigger than 1/3 of ARC, that should help with ARC shrinking to its minimum by heavy mmap() I/O. It is not perfect from perspective of adapting to different workloads, but the best we can do for now. (cherry picked from commit 29746fa)
amotin
approved these changes
Jun 28, 2024
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Setting zfs_arc_shrinker_limit=0 should make ARC more obedient to all kernel shrinker KPI requests, that should help to avoid OOMs.
zfs_arc_pc_percent=300 should prevent file-backed part of page cache from getting bigger than 1/3 of ARC, that should help with ARC shrinking to its minimum by heavy mmap() I/O. It is not perfect from perspective of adapting to different workloads, but the best we can do for now.
Original PR: #13949
Jira URL: https://ixsystems.atlassian.net/browse/NAS-129533