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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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