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ZTS: Add L2ARC DWPD and parallel writes tests

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Add four new functional tests to validate L2ARC DWPD rate limiting and
parallel write features:

- l2arc_dwpd_ratelimit_pos: Verifies DWPD rate limiting with different
  values (0, 100, 1000, 10000) and ordering
- l2arc_dwpd_reimport_pos: Verifies DWPD rate limiting persists after
  pool export/import
- l2arc_multidev_scaling_pos: Verifies parallel write scaling ratio
  (dual devices achieve ~2× single device throughput)
- l2arc_multidev_throughput_pos: Verifies absolute parallel write
  throughput scales with device count (~32MB/s per device)

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18093
This commit is contained in:
Ameer Hamza
2025-12-29 23:44:28 +05:00
committed by Brian Behlendorf
parent 48d3f7fac9
commit 13552d754f
10 changed files with 618 additions and 4 deletions
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tests/zfs-tests/include/tunables.cfg
+1 -1
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@@ -46,12 +46,12 @@ INITIALIZE_CHUNK_SIZE initialize_chunk_size zfs_initialize_chunk_size
INITIALIZE_VALUE initialize_value zfs_initialize_value
KEEP_LOG_SPACEMAPS_AT_EXPORT keep_log_spacemaps_at_export zfs_keep_log_spacemaps_at_export
LUA_MAX_MEMLIMIT lua.max_memlimit zfs_lua_max_memlimit
L2ARC_DWPD_LIMIT l2arc.dwpd_limit l2arc_dwpd_limit
L2ARC_MFUONLY l2arc.mfuonly l2arc_mfuonly
L2ARC_NOPREFETCH l2arc.noprefetch l2arc_noprefetch
L2ARC_REBUILD_BLOCKS_MIN_L2SIZE l2arc.rebuild_blocks_min_l2size l2arc_rebuild_blocks_min_l2size
L2ARC_REBUILD_ENABLED l2arc.rebuild_enabled l2arc_rebuild_enabled
L2ARC_TRIM_AHEAD l2arc.trim_ahead l2arc_trim_ahead
L2ARC_WRITE_BOOST l2arc.write_boost l2arc_write_boost
L2ARC_WRITE_MAX l2arc.write_max l2arc_write_max
LIVELIST_CONDENSE_NEW_ALLOC livelist.condense.new_alloc zfs_livelist_condense_new_alloc
LIVELIST_CONDENSE_SYNC_CANCEL livelist.condense.sync_cancel zfs_livelist_condense_sync_cancel