What's up with the swapping since 10/stable
Matthias Gamsjager
mgamsjager at gmail.com
Sun Feb 2 17:01:11 UTC 2014
Hi,
My ZFS Nas box seems to use some swap since the upgrade to 10/stable. This
machine just runs couple of hours per week and with 9/stable I never
witnessed any swapping when serving media files.
First thinks that caught my eye was the difference between ARC and Wired.
At some point there is a 1+ GB difference while all this machine does is
serving single 10GB mkv via AFP.
Problem is that at some point the performance get's to a point that
streaming isn't possible.
This is after couple of video's watched and scrub 99% done.
No ZFS tuning in /boot/loader.conf
last pid: 2571; load averages: 0.19, 0.20, 0.19 up
0+04:06:20 17:55:43
42 processes: 1 running, 41 sleeping
CPU: 0.0% user, 0.0% nice, 2.3% system, 0.0% interrupt, 97.7% idle
Mem: 32M Active, 14M Inact, 7563M Wired, 16M Cache, 273M Buf, 303M Free
ARC: 6065M Total, 2142M MFU, 3309M MRU, 50K Anon, 136M Header, 478M Other
Swap: 4096M Total, 66M Used, 4030M Free, 1% Inuse
System Information:
Kernel Version: 1000702 (osreldate)
Hardware Platform: amd64
Processor Architecture: amd64
ZFS Storage pool Version: 5000
ZFS Filesystem Version: 5
FreeBSD 10.0-STABLE #0 r261210: Mon Jan 27 15:19:13 CET 2014 matty
5:57PM up 4:08, 2 users, load averages: 0.31, 0.23, 0.21
------------------------------------------------------------------------
System Memory:
0.41% 32.43 MiB Active, 0.18% 14.11 MiB Inact
95.39% 7.39 GiB Wired, 0.21% 16.37 MiB Cache
3.81% 301.97 MiB Free, 0.01% 784.00 KiB Gap
Real Installed: 8.00 GiB
Real Available: 99.50% 7.96 GiB
Real Managed: 97.28% 7.74 GiB
Logical Total: 8.00 GiB
Logical Used: 95.94% 7.68 GiB
Logical Free: 4.06% 332.45 MiB
Kernel Memory: 196.21 MiB
Data: 79.49% 155.96 MiB
Text: 20.51% 40.25 MiB
Kernel Memory Map: 7.74 GiB
Size: 71.72% 5.55 GiB
Free: 28.28% 2.19 GiB
------------------------------------------------------------------------
ARC Summary: (HEALTHY)
Memory Throttle Count: 0
ARC Misc:
Deleted: 34.10k
Recycle Misses: 102.86k
Mutex Misses: 10
Evict Skips: 989.63k
ARC Size: 87.94% 5.93 GiB
Target Size: (Adaptive) 90.63% 6.11 GiB
Min Size (Hard Limit): 12.50% 863.10 MiB
Max Size (High Water): 8:1 6.74 GiB
ARC Size Breakdown:
Recently Used Cache Size: 65.86% 4.02 GiB
Frequently Used Cache Size: 34.14% 2.09 GiB
ARC Hash Breakdown:
Elements Max: 594.22k
Elements Current: 100.00% 594.21k
Collisions: 609.54k
Chain Max: 15
Chains: 122.92k
------------------------------------------------------------------------
ARC Efficiency: 4.19m
Cache Hit Ratio: 83.08% 3.48m
Cache Miss Ratio: 16.92% 708.94k
Actual Hit Ratio: 73.81% 3.09m
Data Demand Efficiency: 79.24% 456.96k
Data Prefetch Efficiency: 2.94% 90.16k
CACHE HITS BY CACHE LIST:
Anonymously Used: 8.80% 306.18k
Most Recently Used: 23.42% 815.06k
Most Frequently Used: 65.43% 2.28m
Most Recently Used Ghost: 0.41% 14.36k
Most Frequently Used Ghost: 1.94% 67.65k
CACHE HITS BY DATA TYPE:
Demand Data: 10.40% 362.08k
Prefetch Data: 0.08% 2.65k
Demand Metadata: 76.84% 2.67m
Prefetch Metadata: 12.68% 441.47k
CACHE MISSES BY DATA TYPE:
Demand Data: 13.38% 94.88k
Prefetch Data: 12.34% 87.51k
Demand Metadata: 34.54% 244.88k
Prefetch Metadata: 39.73% 281.67k
------------------------------------------------------------------------
L2ARC is disabled
------------------------------------------------------------------------
File-Level Prefetch: (HEALTHY)
DMU Efficiency: 9.57m
Hit Ratio: 73.77% 7.06m
Miss Ratio: 26.23% 2.51m
Colinear: 2.51m
Hit Ratio: 0.06% 1.54k
Miss Ratio: 99.94% 2.51m
Stride: 6.92m
Hit Ratio: 99.99% 6.92m
Miss Ratio: 0.01% 594
DMU Misc:
Reclaim: 2.51m
Successes: 0.85% 21.28k
Failures: 99.15% 2.49m
Streams: 137.84k
+Resets: 0.06% 79
-Resets: 99.94% 137.76k
Bogus: 0
------------------------------------------------------------------------
VDEV cache is disabled
------------------------------------------------------------------------
ZFS Tunables (sysctl):
kern.maxusers 845
vm.kmem_size 8313913344
vm.kmem_size_scale 1
vm.kmem_size_min 0
vm.kmem_size_max 1319413950874
vfs.zfs.arc_max 7240171520
vfs.zfs.arc_min 905021440
vfs.zfs.arc_meta_used 2166001368
vfs.zfs.arc_meta_limit 1810042880
vfs.zfs.l2arc_write_max 8388608
vfs.zfs.l2arc_write_boost 8388608
vfs.zfs.l2arc_headroom 2
vfs.zfs.l2arc_feed_secs 1
vfs.zfs.l2arc_feed_min_ms 200
vfs.zfs.l2arc_noprefetch 1
vfs.zfs.l2arc_feed_again 1
vfs.zfs.l2arc_norw 1
vfs.zfs.anon_size 51200
vfs.zfs.anon_metadata_lsize 0
vfs.zfs.anon_data_lsize 0
vfs.zfs.mru_size 3476498432
vfs.zfs.mru_metadata_lsize 1319031808
vfs.zfs.mru_data_lsize 2150589440
vfs.zfs.mru_ghost_size 361860096
vfs.zfs.mru_ghost_metadata_lsize 210866688
vfs.zfs.mru_ghost_data_lsize 150993408
vfs.zfs.mfu_size 2246172672
vfs.zfs.mfu_metadata_lsize 32768
vfs.zfs.mfu_data_lsize 2050486272
vfs.zfs.mfu_ghost_size 6198800896
vfs.zfs.mfu_ghost_metadata_lsize 2818404864
vfs.zfs.mfu_ghost_data_lsize 3380396032
vfs.zfs.l2c_only_size 0
vfs.zfs.dedup.prefetch 1
vfs.zfs.nopwrite_enabled 1
vfs.zfs.mdcomp_disable 0
vfs.zfs.prefetch_disable 0
vfs.zfs.zfetch.max_streams 8
vfs.zfs.zfetch.min_sec_reap 2
vfs.zfs.zfetch.block_cap 256
vfs.zfs.zfetch.array_rd_sz 1048576
vfs.zfs.top_maxinflight 32
vfs.zfs.resilver_delay 2
vfs.zfs.scrub_delay 4
vfs.zfs.scan_idle 50
vfs.zfs.scan_min_time_ms 1000
vfs.zfs.free_min_time_ms 1000
vfs.zfs.resilver_min_time_ms 3000
vfs.zfs.no_scrub_io 0
vfs.zfs.no_scrub_prefetch 0
vfs.zfs.metaslab.gang_bang 131073
vfs.zfs.metaslab.debug 0
vfs.zfs.metaslab.df_alloc_threshold 131072
vfs.zfs.metaslab.df_free_pct 4
vfs.zfs.metaslab.min_alloc_size 10485760
vfs.zfs.metaslab.prefetch_limit 3
vfs.zfs.metaslab.smo_bonus_pct 150
vfs.zfs.mg_alloc_failures 8
vfs.zfs.write_to_degraded 0
vfs.zfs.check_hostid 1
vfs.zfs.recover 0
vfs.zfs.deadman_synctime_ms 1000000
vfs.zfs.deadman_checktime_ms 5000
vfs.zfs.deadman_enabled 1
vfs.zfs.space_map_last_hope 0
vfs.zfs.txg.timeout 5
vfs.zfs.vdev.cache.max 16384
vfs.zfs.vdev.cache.size 0
vfs.zfs.vdev.cache.bshift 16
vfs.zfs.vdev.trim_on_init 1
vfs.zfs.vdev.max_active 1000
vfs.zfs.vdev.sync_read_min_active 10
vfs.zfs.vdev.sync_read_max_active 10
vfs.zfs.vdev.sync_write_min_active 10
vfs.zfs.vdev.sync_write_max_active 10
vfs.zfs.vdev.async_read_min_active 1
vfs.zfs.vdev.async_read_max_active 3
vfs.zfs.vdev.async_write_min_active 1
vfs.zfs.vdev.async_write_max_active 10
vfs.zfs.vdev.scrub_min_active 1
vfs.zfs.vdev.scrub_max_active 2
vfs.zfs.vdev.aggregation_limit 131072
vfs.zfs.vdev.read_gap_limit 32768
vfs.zfs.vdev.write_gap_limit 4096
vfs.zfs.vdev.bio_flush_disable 0
vfs.zfs.vdev.bio_delete_disable 0
vfs.zfs.vdev.trim_max_bytes 2147483648
vfs.zfs.vdev.trim_max_pending 64
vfs.zfs.max_auto_ashift 13
vfs.zfs.zil_replay_disable 0
vfs.zfs.cache_flush_disable 0
vfs.zfs.zio.use_uma 1
vfs.zfs.zio.exclude_metadata 0
vfs.zfs.sync_pass_deferred_free 2
vfs.zfs.sync_pass_dont_compress 5
vfs.zfs.sync_pass_rewrite 2
vfs.zfs.snapshot_list_prefetch 0
vfs.zfs.super_owner 0
vfs.zfs.debug 0
vfs.zfs.version.ioctl 3
vfs.zfs.version.acl 1
vfs.zfs.version.spa 5000
vfs.zfs.version.zpl 5
vfs.zfs.trim.enabled 1
vfs.zfs.trim.txg_delay 32
vfs.zfs.trim.timeout 30
vfs.zfs.trim.max_interval 1
------------------------------------------------------------------------
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