So, vfs.zfs.arc_max="2048M" in /boot/loader.conf was indeed apparently
all that was necessary to bring the situation under control. I remember
it being a lot more nightmarish, so it's nice to see that it's improved.
Thanks for everyone's advice. Per an earlier request, here is the output
of "zfs-stats -a" right now (not when the system is running out of
memory, but perhaps still interesting):
# zfs-stats -a
------------------------------------------------------------------------
ZFS Subsystem Report Mon Apr 4 22:43:43 2011
------------------------------------------------------------------------
System Information:
Kernel Version: 802502 (osreldate)
Hardware Platform: amd64
Processor Architecture: amd64
FreeBSD 8.2-STABLE #3: Sat Apr 2 11:48:43 EDT 2011 spawk
10:43PM up 1:32, 3 users, load averages: 0.13, 0.09, 0.07
------------------------------------------------------------------------
System Memory Statistics:
Physical Memory: 8181.32M
Kernel Memory: 2134.72M
DATA: 99.65% 2127.20M
TEXT: 0.35% 7.52M
------------------------------------------------------------------------
ZFS pool information:
Storage pool Version (spa): 15
Filesystem Version (zpl): 4
------------------------------------------------------------------------
ARC Misc:
Deleted: 583540
Recycle Misses: 355
Mutex Misses: 11
Evict Skips: 11
ARC Size:
Current Size (arcsize): 100.00% 2048.07M
Target Size (Adaptive, c): 100.00% 2048.00M
Min Size (Hard Limit, c_min): 12.50% 256.00M
Max Size (High Water, c_max): ~8:1 2048.00M
ARC Size Breakdown:
Recently Used Cache Size (p): 93.32% 1911.27M
Frequent;y Used Cache Size (arcsize-p): 6.68% 136.80M
ARC Hash Breakdown:
Elements Max: 38168
Elements Current: 99.18% 37856
Collisions: 127822
Chain Max: 5
Chains: 4567
ARC Eviction Statistics:
Evicts Total: 80383607808
Evicts Eligible for L2: 9.95% 8001851392
Evicts Ineligible for L2: 90.05% 72381756416
Evicts Cached to L2: 0
ARC Efficiency:
Cache Access Total: 1439376
Cache Hit Ratio: 55.64% 800797
Cache Miss Ratio: 44.36% 638579
Actual Hit Ratio: 51.12% 735809
Data Demand Efficiency: 97.21%
Data Prefetch Efficiency: 8.78%
CACHE HITS BY CACHE LIST:
Anonymously Used: 5.96% 47738
Most Recently Used (mru): 28.97% 232003
Most Frequently Used (mfu): 62.91% 503806
MRU Ghost (mru_ghost): 0.74% 5933
MFU Ghost (mfu_ghost): 1.41% 11317
CACHE HITS BY DATA TYPE:
Demand Data: 31.17% 249578
Prefetch Data: 7.47% 59804
Demand Metadata: 60.33% 483145
Prefetch Metadata: 1.03% 8270
CACHE MISSES BY DATA TYPE:
Demand Data: 1.12% 7162
Prefetch Data: 97.31% 621373
Demand Metadata: 0.91% 5805
Prefetch Metadata: 0.66% 4239
------------------------------------------------------------------------
VDEV Cache Summary:
Access Total: 32382
Hits Ratio: 21.62% 7001
Miss Ratio: 78.38% 25381
Delegations: 11361
------------------------------------------------------------------------
File-Level Prefetch Stats (DMU):
DMU Efficiency:
Access Total: 640507
Hit Ratio: 92.40% 591801
Miss Ratio: 7.60% 48706
Colinear Access Total: 48706
Colinear Hit Ratio: 0.20% 99
Colinear Miss Ratio: 99.80% 48607
Stride Access Total: 533456
Stride Hit Ratio: 99.97% 533296
Stride Miss Ratio: 0.03% 160
DMU misc:
Reclaim successes: 8857
Reclaim failures: 39750
Stream resets: 126
Stream noresets: 58504
Bogus streams: 0
------------------------------------------------------------------------
ZFS Tunable (sysctl):
kern.maxusers=384
vfs.zfs.l2c_only_size=0
vfs.zfs.mfu_ghost_data_lsize=1956972544
vfs.zfs.mfu_ghost_metadata_lsize=12218880
vfs.zfs.mfu_ghost_size=1969191424
vfs.zfs.mfu_data_lsize=103428096
vfs.zfs.mfu_metadata_lsize=17053184
vfs.zfs.mfu_size=124921344
vfs.zfs.mru_ghost_data_lsize=133824512
vfs.zfs.mru_ghost_metadata_lsize=40669184
vfs.zfs.mru_ghost_size=174493696
vfs.zfs.mru_data_lsize=1984430080
vfs.zfs.mru_metadata_lsize=14490112
vfs.zfs.mru_size=2005246464
vfs.zfs.anon_data_lsize=0
vfs.zfs.anon_metadata_lsize=0
vfs.zfs.anon_size=0
vfs.zfs.l2arc_norw=1
vfs.zfs.l2arc_feed_again=1
vfs.zfs.l2arc_noprefetch=0
vfs.zfs.l2arc_feed_min_ms=200
vfs.zfs.l2arc_feed_secs=1
vfs.zfs.l2arc_headroom=2
vfs.zfs.l2arc_write_boost=8388608
vfs.zfs.l2arc_write_max=8388608
vfs.zfs.arc_meta_limit=536870912
vfs.zfs.arc_meta_used=59699288
vfs.zfs.mdcomp_disable=0
vfs.zfs.arc_min=268435456
vfs.zfs.arc_max=2147483648
vfs.zfs.zfetch.array_rd_sz=1048576
vfs.zfs.zfetch.block_cap=256
vfs.zfs.zfetch.min_sec_reap=2
vfs.zfs.zfetch.max_streams=8
vfs.zfs.prefetch_disable=0
vfs.zfs.check_hostid=1
vfs.zfs.recover=0
vfs.zfs.txg.write_limit_override=0
vfs.zfs.txg.synctime=5
vfs.zfs.txg.timeout=30
vfs.zfs.scrub_limit=10
vfs.zfs.vdev.cache.bshift=16
vfs.zfs.vdev.cache.size=10485760
vfs.zfs.vdev.cache.max=16384
vfs.zfs.vdev.aggregation_limit=131072
vfs.zfs.vdev.ramp_rate=2
vfs.zfs.vdev.time_shift=6
vfs.zfs.vdev.min_pending=4
vfs.zfs.vdev.max_pending=10
vfs.zfs.cache_flush_disable=0
vfs.zfs.zil_disable=0
vfs.zfs.zio.use_uma=0
vfs.zfs.version.zpl=4
vfs.zfs.version.spa=15
vfs.zfs.version.dmu_backup_stream=1
vfs.zfs.version.dmu_backup_header=2
vfs.zfs.version.acl=1
vfs.zfs.debug=0
vfs.zfs.super_owner=0
vm.kmem_size=8294764544
vm.kmem_size_scale=1
vm.kmem_size_min=0
vm.kmem_size_max=329853485875
------------------------------------------------------------------------
-Boris
_______________________________________________
freebsd-stable@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
