Date: Tue, 07 Feb 2012 22:03:39 +0600 From: "Eugene M. Zheganin" <emz@norma.perm.ru> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: zfs arc and amount of wired memory Message-ID: <4F314B5B.100@norma.perm.ru> In-Reply-To: <4F314892.50806@FreeBSD.org> References: <4F30E284.8080905@norma.perm.ru> <4F310115.3070507@FreeBSD.org> <4F310C5A.6070400@norma.perm.ru> <4F310E75.7090301@FreeBSD.org> <4F3144A9.2000505@norma.perm.ru> <4F314892.50806@FreeBSD.org>
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Hi.
On 07.02.2012 21:51, Andriy Gapon wrote:
>
> I am not sure that these conclusions are correct. Wired is wired, it's not free.
> BTW, are you reluctant to share the full zfs-stats -a output? You don't have to
> place it inline, you can upload it somewhere and provide a link.
>
Well... nothing secret in it (in case someone will be interested too and
so it stays in maillist archive):
===Cut===
[emz@taiga:~]> zfs-stats -a
------------------------------------------------------------------------
ZFS Subsystem Report Tue Feb 7 22:01:09 2012
------------------------------------------------------------------------
System Information:
Kernel Version: 900044 (osreldate)
Hardware Platform: amd64
Processor Architecture: amd64
ZFS Storage pool Version: 28
ZFS Filesystem Version: 5
FreeBSD 9.0-RELEASE #1: Mon Jan 23 13:36:16 YEKT 2012 emz
22:01 up 11 days, 2:44, 4 users, load averages: 0,30 0,26 0,32
------------------------------------------------------------------------
System Memory:
4.30% 169.09 MiB Active, 1.04% 40.95 MiB Inact
90.80% 3.48 GiB Wired, 2.17% 85.25 MiB Cache
0.69% 27.30 MiB Free, 0.99% 39.08 MiB Gap
Real Installed: 4.00 GiB
Real Available: 99.61% 3.98 GiB
Real Managed: 96.31% 3.84 GiB
Logical Total: 4.00 GiB
Logical Used: 96.25% 3.85 GiB
Logical Free: 3.75% 153.50 MiB
Kernel Memory: 397.53 MiB
Data: 96.18% 382.33 MiB
Text: 3.82% 15.20 MiB
Kernel Memory Map: 2.69 GiB
Size: 9.93% 273.20 MiB
Free: 90.07% 2.42 GiB
------------------------------------------------------------------------
ARC Summary: (THROTTLED)
Memory Throttle Count: 3.20k
ARC Misc:
Deleted: 10.83m
Recycle Misses: 1.55m
Mutex Misses: 7.80k
Evict Skips: 7.80k
ARC Size: 12.50% 363.20 MiB
Target Size: (Adaptive) 12.50% 363.18 MiB
Min Size (Hard Limit): 12.50% 363.18 MiB
Max Size (High Water): 8:1 2.84 GiB
ARC Size Breakdown:
Recently Used Cache Size: 56.17% 204.02 MiB
Frequently Used Cache Size: 43.83% 159.18 MiB
ARC Hash Breakdown:
Elements Max: 191.41k
Elements Current: 32.79% 62.76k
Collisions: 28.06m
Chain Max: 17
Chains: 12.77k
------------------------------------------------------------------------
ARC Efficiency: 179.54m
Cache Hit Ratio: 95.07% 170.68m
Cache Miss Ratio: 4.93% 8.86m
Actual Hit Ratio: 95.07% 170.68m
Data Demand Efficiency: 94.72% 152.53m
Data Prefetch Efficiency: 0.00% 20
CACHE HITS BY CACHE LIST:
Most Recently Used: 30.50% 52.05m
Most Frequently Used: 69.50% 118.63m
Most Recently Used Ghost: 0.30% 517.41k
Most Frequently Used Ghost: 1.02% 1.74m
CACHE HITS BY DATA TYPE:
Demand Data: 84.65% 144.48m
Prefetch Data: 0.00% 0
Demand Metadata: 15.35% 26.20m
Prefetch Metadata: 0.00% 52
CACHE MISSES BY DATA TYPE:
Demand Data: 90.88% 8.05m
Prefetch Data: 0.00% 20
Demand Metadata: 9.12% 807.98k
Prefetch Metadata: 0.00% 172
------------------------------------------------------------------------
L2ARC is disabled
------------------------------------------------------------------------
------------------------------------------------------------------------
VDEV cache is disabled
------------------------------------------------------------------------
ZFS Tunables (sysctl):
kern.maxusers 384
vm.kmem_size 4120326144
vm.kmem_size_scale 1
vm.kmem_size_min 0
vm.kmem_size_max 329853485875
vfs.zfs.l2c_only_size 0
vfs.zfs.mfu_ghost_data_lsize 114792960
vfs.zfs.mfu_ghost_metadata_lsize 69912064
vfs.zfs.mfu_ghost_size 184705024
vfs.zfs.mfu_data_lsize 26686464
vfs.zfs.mfu_metadata_lsize 13492736
vfs.zfs.mfu_size 45798912
vfs.zfs.mru_ghost_data_lsize 22662656
vfs.zfs.mru_ghost_metadata_lsize 142631424
vfs.zfs.mru_ghost_size 165294080
vfs.zfs.mru_data_lsize 149837312
vfs.zfs.mru_metadata_lsize 6439424
vfs.zfs.mru_size 215066624
vfs.zfs.anon_data_lsize 0
vfs.zfs.anon_metadata_lsize 0
vfs.zfs.anon_size 1421824
vfs.zfs.l2arc_norw 1
vfs.zfs.l2arc_feed_again 1
vfs.zfs.l2arc_noprefetch 1
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 761646080
vfs.zfs.arc_meta_used 202913864
vfs.zfs.arc_min 380823040
vfs.zfs.arc_max 3046584320
vfs.zfs.dedup.prefetch 1
vfs.zfs.mdcomp_disable 0
vfs.zfs.write_limit_override 0
vfs.zfs.write_limit_inflated 12834803712
vfs.zfs.write_limit_max 534783488
vfs.zfs.write_limit_min 33554432
vfs.zfs.write_limit_shift 3
vfs.zfs.no_write_throttle 0
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 1
vfs.zfs.mg_alloc_failures 8
vfs.zfs.check_hostid 1
vfs.zfs.recover 0
vfs.zfs.txg.synctime_ms 1000
vfs.zfs.txg.timeout 5
vfs.zfs.scrub_limit 10
vfs.zfs.vdev.cache.bshift 16
vfs.zfs.vdev.cache.size 0
vfs.zfs.vdev.cache.max 16384
vfs.zfs.vdev.write_gap_limit 4096
vfs.zfs.vdev.read_gap_limit 32768
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.vdev.bio_flush_disable 0
vfs.zfs.cache_flush_disable 0
vfs.zfs.zil_replay_disable 0
vfs.zfs.zio.use_uma 0
vfs.zfs.version.zpl 5
vfs.zfs.version.spa 28
vfs.zfs.version.acl 1
vfs.zfs.debug 0
vfs.zfs.super_owner 0
------------------------------------------------------------------------
[emz@taiga:~]>
===Cut===
Thanks.
Eugene.
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