zfs arc and amount of wired memory

[Andriy Gapon]

on 07/02/2012 13:34 Eugene M. Zheganin said the following:
> Hi.
> 
> On 07.02.2012 16:46, Andriy Gapon wrote:
>> on 07/02/2012 10:36 Eugene M. Zheganin said the following:
>>> If I use the script from http://wiki.freebsd.org/ZFSTuningGuide , it says:
>>>
>>> ===Cut===
>>> ARC Size:                               12.50%  363.14  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
>>> ===Cut===
>>>
>>> At the same time I have 3500 megs in wired state:
>>>
>>>
>>> Please try sysutils/zfs-stats; zfs-stats -a output should provide a good
>>> overview of the state and configuration of the system.
>>>
> Thanks.  But it seems to be the same script. Anyway, it reports the same amount
> of memory:
> 
> [emz at taiga:~]# zfs-stats -A

zfs-stats -A is not the same as zfs-stats -a

> ------------------------------------------------------------------------
> ZFS Subsystem Report                            Tue Feb  7 17:32:34 2012
> ------------------------------------------------------------------------
> 
> ARC Summary: (THROTTLED)
>         Memory Throttle Count:                  2.62k
> 
> ARC Misc:
>         Deleted:                                10.17m
>         Recycle Misses:                         1.47m
>         Mutex Misses:                           7.69k
>         Evict Skips:                            7.69k
> 
> ARC Size:                               12.50%  363.24  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:       57.54%  209.01  MiB
>         Frequently Used Cache Size:     42.46%  154.22  MiB
> 
> ARC Hash Breakdown:
>         Elements Max:                           191.41k
>         Elements Current:               33.76%  64.63k
>         Collisions:                             27.09m
>         Chain Max:                              17
>         Chains:                                 13.56k
> 
> ------------------------------------------------------------------------
> 
> I still don't get why I have 3/5 Gigs in wired state.
> 
> Thanks.
> 
> Eugene.
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-- 
Andriy Gapon