What's up with the swapping since 10/stable
Johan Broman
johan at bridgenet.se
Thu Apr 3 19:34:24 UTC 2014
Hi!
I’m seeing the same thing since upgrading to 10/stable. Things seems to need swap although there is still available memory. I tend not to use swap on my virtual instances but I’ve seen error messages like this since upgrading to 10/stable:
pid 3028 (mysqld), uid 88, was killed: out of swap space
Mem: 24M Active, 8012K Inact, 109M Wired, 2176K Cache, 69M Buf, 433M Free
Looks like there should be enough memory to start mysql… (the above instance is a t1.micro FreeBSD AMI running on AWS EC2, created by Colin Percival)
Something seems to have changed since FreeBSD 9 in terms of memory manager / page eviction.
Anyone else seeing this? Is it now impossible to run FreeBSD without a swap partition (and or file)? This happens on my server as well which has 8GB RAM and plenty of free RAM…
I don’t want to start guessing, but perhaps this happens when there is some memory fragmentation…? I need to verify if this is the case though.
Thanks
Johan
On 02 Feb 2014, at 18:00, Matthias Gamsjager <mgamsjager at gmail.com> wrote:
> 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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