Package: zfsutils-linux Version: 2.3.1-1~bpo12+1 Severity: normal Hello,
In arc_summary's states breakdown, I noticed these rows: MFU data target: -373596196279.3 % -27644722171524358144 Bytes MRU data target: 373596196366.3 % 24.0 EiB I think these are wrong. I'm guessing some sort of signed arithmetic bug. Full arc_summary output and /proc/spl/kstat/zfs/arcstats attached. -- System Information: Debian Release: 12.10 APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 'stable'), (500, 'oldstable'), (490, 'testing-debug'), (490, 'testing'), (400, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 6.12.12+bpo-amd64 (SMP w/8 CPU threads; PREEMPT) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages zfsutils-linux depends on: ii init-system-helpers 1.65.2 ii libblkid1 2.38.1-5+deb12u3 ii libc6 2.36-9+deb12u10 ii libnvpair3linux 2.3.1-1~bpo12+1 ii libssl3 3.0.15-1~deb12u1 ii libudev1 252.36-1~deb12u1 ii libuuid1 2.38.1-5+deb12u3 ii libuutil3linux 2.3.1-1~bpo12+1 ii libzfs6linux 2.3.1-1~bpo12+1 ii libzpool6linux 2.3.1-1~bpo12+1 ii python3 3.11.2-1+b1 Versions of packages zfsutils-linux recommends: ii zfs-dkms [zfs-modules] 2.3.1-1~bpo12+1 ii zfs-zed 2.3.1-1~bpo12+1 Versions of packages zfsutils-linux suggests: ii nfs-kernel-server 1:2.6.2-4+deb12u1 pn samba-common-bin <none> pn zfs-initramfs | zfs-dracut <none> -- Configuration Files: /etc/sudoers.d/zfs [Errno 13] Permission denied: '/etc/sudoers.d/zfs' -- no debconf information
------------------------------------------------------------------------
ZFS Subsystem Report Wed May 14 11:11:06 2025
Linux 6.12.12+bpo-amd64 2.3.1-1~bpo12+1
Machine: grook (x86_64) 2.3.1-1~bpo12+1
ARC status:
Total memory size: 31.3 GiB
Min target size: 3.1 % 1000.1 MiB
Max target size: 96.8 % 30.3 GiB
Target size (adaptive): 25.2 % 7.6 GiB
Current size: 25.2 % 7.6 GiB
Free memory size: 10.9 GiB
Available memory size: 9.8 GiB
ARC structural breakdown (current size): 7.6 GiB
Compressed size: 81.9 % 6.2 GiB
Overhead size: 8.4 % 653.5 MiB
Bonus size: 1.6 % 128.5 MiB
Dnode size: 5.1 % 394.6 MiB
Dbuf size: 2.1 % 160.1 MiB
Header size: 0.9 % 72.5 MiB
L2 header size: 0.0 % 0 Bytes
ABD chunk waste size: < 0.1 % 2.2 MiB
ARC types breakdown (compressed + overhead): 6.9 GiB
Data size: 87.4 % 6.0 GiB
Metadata size: 12.6 % 888.6 MiB
ARC states breakdown (compressed + overhead): 6.9 GiB
Anonymous data size: 0.0 % 0 Bytes
Anonymous metadata size: 0.0 % 0 Bytes
MFU data target: -373596196279.3 % -27571698640571867136 Bytes
MFU data size: 1.2 % 83.7 MiB
MFU evictable data size: < 0.1 % 536.0 KiB
MFU ghost data size: 3.4 GiB
MFU metadata target: 8.6 % 608.0 MiB
MFU metadata size: 11.0 % 775.6 MiB
MFU evictable metadata size: 1.0 % 71.7 MiB
MFU ghost metadata size: 2.6 GiB
MRU data target: 373596196366.3 % 23.9 EiB
MRU data size: 86.2 % 5.9 GiB
MRU evictable data size: 86.1 % 5.9 GiB
MRU ghost data size: 486.1 MiB
MRU metadata target: 4.4 % 308.1 MiB
MRU metadata size: 1.6 % 113.0 MiB
MRU evictable metadata size: 1.1 % 79.7 MiB
MRU ghost metadata size: 1.3 GiB
Uncached data size: 0.0 % 0 Bytes
Uncached metadata size: 0.0 % 0 Bytes
ARC hash breakdown:
Elements: 311.9k
Collisions: 5.8M
Chain max: 5
Chains: 11.0k
ARC misc:
Memory throttles: 0
Memory direct reclaims: 199891
Memory indirect reclaims: 11724655
Deleted: 67.9M
Mutex misses: 4.7k
Eviction skips: 5.6M
Eviction skips due to L2 writes: 0
L2 cached evictions: 0 Bytes
L2 eligible evictions: 7.8 TiB
L2 eligible MFU evictions: 12.8 % 1.0 TiB
L2 eligible MRU evictions: 87.2 % 6.8 TiB
L2 ineligible evictions: 367.2 GiB
ARC total accesses: 772.7M
Total hits: 90.2 % 697.1M
Total I/O hits: 1.5 % 11.9M
Total misses: 8.2 % 63.7M
ARC demand data accesses: 37.6 % 290.5M
Demand data hits: 98.1 % 284.9M
Demand data I/O hits: 0.4 % 1.0M
Demand data misses: 1.6 % 4.6M
ARC demand metadata accesses: 51.5 % 397.6M
Demand metadata hits: 98.9 % 393.1M
Demand metadata I/O hits: 0.1 % 245.3k
Demand metadata misses: 1.1 % 4.2M
ARC prefetch data accesses: 7.5 % 58.1M
Prefetch data hits: 8.4 % 4.9M
Prefetch data I/O hits: 0.3 % 187.5k
Prefetch data misses: 91.3 % 53.1M
ARC prefetch metadata accesses: 3.4 % 26.5M
Prefetch metadata hits: 53.8 % 14.3M
Prefetch metadata I/O hits: 39.4 % 10.4M
Prefetch metadata misses: 6.9 % 1.8M
ARC predictive prefetches: 97.5 % 82.5M
Demand hits after predictive: 62.7 % 51.7M
Demand I/O hits after predictive: 1.6 % 1.3M
Never demanded after predictive: 35.7 % 29.5M
ARC prescient prefetches: 2.5 % 2.1M
Demand hits after prescient: 39.8 % 850.6k
Demand I/O hits after prescient: < 0.1 % 944
Never demanded after prescient: 60.2 % 1.3M
ARC states hits of all accesses:
Most frequently used (MFU): 57.1 % 441.2M
Most recently used (MRU): 33.1 % 255.9M
Most frequently used (MFU) ghost: 0.4 % 3.0M
Most recently used (MRU) ghost: 0.2 % 1.9M
Uncached: 0.0 % 0
DMU predictive prefetcher calls: 273.9M
Stream hits: 75.7 % 207.4M
Hits ahead of stream: 4.3 % 11.7M
Hits behind stream: 12.4 % 33.9M
Stream misses: 7.6 % 20.9M
Streams limit reached: 83.6 % 17.5M
Stream strides: 367.0k
Prefetches issued 54.8M
L2ARC not detected, skipping section
Solaris Porting Layer (SPL):
spl_hostid 0
spl_hostid_path /etc/hostid
spl_kmem_alloc_max 1048576
spl_kmem_alloc_warn 65536
spl_kmem_cache_kmem_threads 4
spl_kmem_cache_magazine_size 0
spl_kmem_cache_max_size 32
spl_kmem_cache_obj_per_slab 8
spl_kmem_cache_slab_limit 16384
spl_panic_halt 0
spl_schedule_hrtimeout_slack_us 0
spl_taskq_kick 0
spl_taskq_thread_bind 0
spl_taskq_thread_dynamic 1
spl_taskq_thread_priority 1
spl_taskq_thread_sequential 4
spl_taskq_thread_timeout_ms 5000
Tunables:
brt_zap_default_bs 12
brt_zap_default_ibs 12
brt_zap_prefetch 1
dbuf_cache_hiwater_pct 10
dbuf_cache_lowater_pct 10
dbuf_cache_max_bytes 18446744073709551615
dbuf_cache_shift 5
dbuf_metadata_cache_max_bytes 18446744073709551615
dbuf_metadata_cache_shift 6
dbuf_mutex_cache_shift 0
ddt_zap_default_bs 15
ddt_zap_default_ibs 15
dmu_ddt_copies 0
dmu_object_alloc_chunk_shift 7
dmu_prefetch_max 134217728
icp_aes_impl cycle [fastest] generic x86_64 aesni
icp_gcm_avx_chunk_size 32736
icp_gcm_impl cycle [fastest] avx generic pclmulqdq
ignore_hole_birth 1
l2arc_exclude_special 0
l2arc_feed_again 1
l2arc_feed_min_ms 200
l2arc_feed_secs 1
l2arc_headroom 8
l2arc_headroom_boost 200
l2arc_meta_percent 33
l2arc_mfuonly 0
l2arc_noprefetch 1
l2arc_norw 0
l2arc_rebuild_blocks_min_l2size 1073741824
l2arc_rebuild_enabled 1
l2arc_trim_ahead 0
l2arc_write_boost 33554432
l2arc_write_max 33554432
metaslab_aliquot 1048576
metaslab_bias_enabled 1
metaslab_debug_load 0
metaslab_debug_unload 0
metaslab_df_max_search 16777216
metaslab_df_use_largest_segment 0
metaslab_force_ganging 16777217
metaslab_force_ganging_pct 3
metaslab_fragmentation_factor_enabled 1
metaslab_lba_weighting_enabled 1
metaslab_preload_enabled 1
metaslab_preload_limit 10
metaslab_preload_pct 50
metaslab_unload_delay 32
metaslab_unload_delay_ms 600000
raidz_expand_max_copy_bytes 167772160
raidz_expand_max_reflow_bytes 0
raidz_io_aggregate_rows 4
send_holes_without_birth_time 1
spa_asize_inflation 24
spa_config_path /etc/zfs/zpool.cache
spa_cpus_per_allocator 4
spa_load_print_vdev_tree 0
spa_load_verify_data 1
spa_load_verify_metadata 1
spa_load_verify_shift 4
spa_num_allocators 4
spa_slop_shift 5
spa_upgrade_errlog_limit 0
vdev_file_logical_ashift 9
vdev_file_physical_ashift 9
vdev_removal_max_span 32768
vdev_validate_skip 0
zap_iterate_prefetch 1
zap_micro_max_size 131072
zap_shrink_enabled 1
zfetch_hole_shift 2
zfetch_max_distance 67108864
zfetch_max_idistance 134217728
zfetch_max_reorder 16777216
zfetch_max_sec_reap 2
zfetch_max_streams 8
zfetch_min_distance 4194304
zfetch_min_sec_reap 1
zfs_abd_scatter_enabled 1
zfs_abd_scatter_max_order 9
zfs_abd_scatter_min_size 1536
zfs_active_allocator dynamic
zfs_admin_snapshot 0
zfs_allow_redacted_dataset_mount 0
zfs_arc_average_blocksize 8192
zfs_arc_dnode_limit 0
zfs_arc_dnode_limit_percent 10
zfs_arc_dnode_reduce_percent 10
zfs_arc_evict_batch_limit 10
zfs_arc_eviction_pct 200
zfs_arc_grow_retry 0
zfs_arc_lotsfree_percent 10
zfs_arc_max 0
zfs_arc_meta_balance 500
zfs_arc_min 0
zfs_arc_min_prefetch_ms 0
zfs_arc_min_prescient_prefetch_ms 0
zfs_arc_pc_percent 0
zfs_arc_prune_task_threads 1
zfs_arc_shrink_shift 0
zfs_arc_shrinker_limit 0
zfs_arc_shrinker_seeks 2
zfs_arc_sys_free 0
zfs_async_block_max_blocks 18446744073709551615
zfs_autoimport_disable 1
zfs_bclone_enabled 1
zfs_bclone_wait_dirty 0
zfs_blake3_impl cycle [fastest] generic sse2 sse41 avx2
zfs_btree_verify_intensity 0
zfs_checksum_events_per_second 20
zfs_commit_timeout_pct 10
zfs_compressed_arc_enabled 1
zfs_condense_indirect_commit_entry_delay_ms 0
zfs_condense_indirect_obsolete_pct 25
zfs_condense_indirect_vdevs_enable 1
zfs_condense_max_obsolete_bytes 1073741824
zfs_condense_min_mapping_bytes 131072
zfs_dbgmsg_enable 1
zfs_dbgmsg_maxsize 4194304
zfs_dbuf_state_index 0
zfs_ddt_data_is_special 1
zfs_deadman_checktime_ms 60000
zfs_deadman_enabled 1
zfs_deadman_events_per_second 1
zfs_deadman_failmode wait
zfs_deadman_synctime_ms 600000
zfs_deadman_ziotime_ms 300000
zfs_dedup_log_flush_entries_min 1000
zfs_dedup_log_flush_flow_rate_txgs 10
zfs_dedup_log_flush_min_time_ms 1000
zfs_dedup_log_flush_passes_max 8
zfs_dedup_log_mem_max 335584747
zfs_dedup_log_mem_max_percent 1
zfs_dedup_log_txg_max 8
zfs_dedup_prefetch 0
zfs_default_bs 9
zfs_default_ibs 17
zfs_delay_min_dirty_percent 60
zfs_delay_scale 500000
zfs_delete_blocks 20480
zfs_dio_enabled 1
zfs_dio_write_verify_events_per_second 20
zfs_dirty_data_max 3355847475
zfs_dirty_data_max_max 4294967296
zfs_dirty_data_max_max_percent 25
zfs_dirty_data_max_percent 10
zfs_dirty_data_sync_percent 20
zfs_disable_ivset_guid_check 0
zfs_dmu_offset_next_sync 1
zfs_embedded_slog_min_ms 64
zfs_expire_snapshot 300
zfs_fallocate_reserve_percent 110
zfs_flags 0
zfs_fletcher_4_impl [fastest] scalar superscalar superscalar4 sse2
ssse3 avx2
zfs_free_bpobj_enabled 1
zfs_free_leak_on_eio 0
zfs_free_min_time_ms 1000
zfs_history_output_max 1048576
zfs_immediate_write_sz 32768
zfs_initialize_chunk_size 1048576
zfs_initialize_value 16045690984833335022
zfs_keep_log_spacemaps_at_export 0
zfs_key_max_salt_uses 400000000
zfs_livelist_condense_new_alloc 0
zfs_livelist_condense_sync_cancel 0
zfs_livelist_condense_sync_pause 0
zfs_livelist_condense_zthr_cancel 0
zfs_livelist_condense_zthr_pause 0
zfs_livelist_max_entries 500000
zfs_livelist_min_percent_shared 75
zfs_lua_max_instrlimit 100000000
zfs_lua_max_memlimit 104857600
zfs_max_async_dedup_frees 100000
zfs_max_dataset_nesting 50
zfs_max_log_walking 5
zfs_max_logsm_summary_length 10
zfs_max_missing_tvds 0
zfs_max_nvlist_src_size 0
zfs_max_recordsize 16777216
zfs_metaslab_find_max_tries 100
zfs_metaslab_fragmentation_threshold 77
zfs_metaslab_max_size_cache_sec 3600
zfs_metaslab_mem_limit 25
zfs_metaslab_segment_weight_enabled 1
zfs_metaslab_switch_threshold 2
zfs_metaslab_try_hard_before_gang 0
zfs_mg_fragmentation_threshold 95
zfs_mg_noalloc_threshold 0
zfs_min_metaslabs_to_flush 1
zfs_multihost_fail_intervals 10
zfs_multihost_history 0
zfs_multihost_import_intervals 20
zfs_multihost_interval 1000
zfs_multilist_num_sublists 0
zfs_no_scrub_io 0
zfs_no_scrub_prefetch 0
zfs_nocacheflush 0
zfs_nopwrite_enabled 1
zfs_object_mutex_size 64
zfs_obsolete_min_time_ms 500
zfs_override_estimate_recordsize 0
zfs_pd_bytes_max 52428800
zfs_per_txg_dirty_frees_percent 30
zfs_prefetch_disable 0
zfs_read_history 0
zfs_read_history_hits 0
zfs_rebuild_max_segment 1048576
zfs_rebuild_scrub_enabled 1
zfs_rebuild_vdev_limit 67108864
zfs_reconstruct_indirect_combinations_max 4096
zfs_recover 0
zfs_recv_best_effort_corrective 0
zfs_recv_queue_ff 20
zfs_recv_queue_length 16777216
zfs_recv_write_batch_size 1048576
zfs_removal_ignore_errors 0
zfs_removal_suspend_progress 0
zfs_remove_max_segment 16777216
zfs_resilver_defer_percent 10
zfs_resilver_disable_defer 0
zfs_resilver_min_time_ms 3000
zfs_scan_blkstats 0
zfs_scan_checkpoint_intval 7200
zfs_scan_fill_weight 3
zfs_scan_ignore_errors 0
zfs_scan_issue_strategy 0
zfs_scan_legacy 0
zfs_scan_max_ext_gap 2097152
zfs_scan_mem_lim_fact 20
zfs_scan_mem_lim_soft_fact 20
zfs_scan_report_txgs 0
zfs_scan_strict_mem_lim 0
zfs_scan_suspend_progress 0
zfs_scan_vdev_limit 16777216
zfs_scrub_after_expand 1
zfs_scrub_error_blocks_per_txg 4096
zfs_scrub_min_time_ms 1000
zfs_send_corrupt_data 0
zfs_send_no_prefetch_queue_ff 20
zfs_send_no_prefetch_queue_length 1048576
zfs_send_queue_ff 20
zfs_send_queue_length 16777216
zfs_send_unmodified_spill_blocks 1
zfs_sha256_impl cycle [fastest] generic x64 ssse3 avx avx2
zfs_sha512_impl cycle [fastest] generic x64 avx avx2
zfs_slow_io_events_per_second 20
zfs_snapshot_history_enabled 1
zfs_snapshot_no_setuid 0
zfs_spa_discard_memory_limit 16777216
zfs_special_class_metadata_reserve_pct 25
zfs_sync_pass_deferred_free 2
zfs_sync_pass_dont_compress 8
zfs_sync_pass_rewrite 2
zfs_traverse_indirect_prefetch_limit 32
zfs_trim_extent_bytes_max 134217728
zfs_trim_extent_bytes_min 32768
zfs_trim_metaslab_skip 0
zfs_trim_queue_limit 10
zfs_trim_txg_batch 32
zfs_txg_history 100
zfs_txg_timeout 5
zfs_unflushed_log_block_max 131072
zfs_unflushed_log_block_min 1000
zfs_unflushed_log_block_pct 400
zfs_unflushed_log_txg_max 1000
zfs_unflushed_max_mem_amt 1073741824
zfs_unflushed_max_mem_ppm 1000
zfs_unlink_suspend_progress 0
zfs_user_indirect_is_special 1
zfs_vdev_aggregation_limit 1048576
zfs_vdev_aggregation_limit_non_rotating 131072
zfs_vdev_async_read_max_active 3
zfs_vdev_async_read_min_active 1
zfs_vdev_async_write_active_max_dirty_percent 60
zfs_vdev_async_write_active_min_dirty_percent 30
zfs_vdev_async_write_max_active 10
zfs_vdev_async_write_min_active 2
zfs_vdev_def_queue_depth 32
zfs_vdev_default_ms_count 200
zfs_vdev_default_ms_shift 29
zfs_vdev_direct_write_verify 1
zfs_vdev_disk_classic 0
zfs_vdev_disk_max_segs 0
zfs_vdev_failfast_mask 1
zfs_vdev_initializing_max_active 1
zfs_vdev_initializing_min_active 1
zfs_vdev_max_active 1000
zfs_vdev_max_auto_ashift 14
zfs_vdev_max_ms_shift 34
zfs_vdev_min_auto_ashift 9
zfs_vdev_min_ms_count 16
zfs_vdev_mirror_non_rotating_inc 0
zfs_vdev_mirror_non_rotating_seek_inc 1
zfs_vdev_mirror_rotating_inc 0
zfs_vdev_mirror_rotating_seek_inc 5
zfs_vdev_mirror_rotating_seek_offset 1048576
zfs_vdev_ms_count_limit 131072
zfs_vdev_nia_credit 5
zfs_vdev_nia_delay 5
zfs_vdev_open_timeout_ms 1000
zfs_vdev_queue_depth_pct 1000
zfs_vdev_raidz_impl cycle [fastest] original scalar sse2 ssse3 avx2
zfs_vdev_read_gap_limit 32768
zfs_vdev_rebuild_max_active 3
zfs_vdev_rebuild_min_active 1
zfs_vdev_removal_max_active 2
zfs_vdev_removal_min_active 1
zfs_vdev_scheduler unused
zfs_vdev_scrub_max_active 3
zfs_vdev_scrub_min_active 1
zfs_vdev_sync_read_max_active 10
zfs_vdev_sync_read_min_active 10
zfs_vdev_sync_write_max_active 10
zfs_vdev_sync_write_min_active 10
zfs_vdev_trim_max_active 2
zfs_vdev_trim_min_active 1
zfs_vdev_write_gap_limit 4096
zfs_vnops_read_chunk_size 1048576
zfs_wrlog_data_max 6711694950
zfs_xattr_compat 0
zfs_zevent_len_max 512
zfs_zevent_retain_expire_secs 900
zfs_zevent_retain_max 2000
zfs_zil_clean_taskq_maxalloc 1048576
zfs_zil_clean_taskq_minalloc 1024
zfs_zil_clean_taskq_nthr_pct 100
zfs_zil_saxattr 1
zil_maxblocksize 131072
zil_maxcopied 7680
zil_nocacheflush 0
zil_replay_disable 0
zil_slog_bulk 67108864
zio_deadman_log_all 0
zio_dva_throttle_enabled 1
zio_requeue_io_start_cut_in_line 1
zio_slow_io_ms 30000
zio_taskq_batch_pct 80
zio_taskq_batch_tpq 0
zio_taskq_read fixed,1,8 null scale null
zio_taskq_write sync null scale null
zio_taskq_write_tpq 16
zstd_abort_size 131072
zstd_earlyabort_pass 1
zvol_blk_mq_blocks_per_thread 8
zvol_blk_mq_queue_depth 128
zvol_enforce_quotas 1
zvol_inhibit_dev 0
zvol_major 230
zvol_max_discard_blocks 16384
zvol_num_taskqs 0
zvol_open_timeout_ms 1000
zvol_prefetch_bytes 131072
zvol_request_sync 0
zvol_threads 0
zvol_use_blk_mq 0
zvol_volmode 1
ZIL committed transactions: 14.9k
Commit requests: 997
Flushes to stable storage: 997
Transactions to SLOG storage pool: 0 Bytes 0
Transactions to non-SLOG storage pool: 40.6 MiB 1.4k
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