ZFS and Wired memory, again

[Anton Sayetsky]

2014-02-28 20:42 GMT+02:00 Larry Rosenman <ler at lerctr.org>:
> On 2014-02-28 12:31, Anton Sayetsky wrote:
>>
>> 2014-02-28 13:47 GMT+02:00 Matthias Gamsjager <mgamsjager at gmail.com>:
>>>>>
>>>>>
>>>>
>>>> +1 from me, FreeBSD 10, uma=0
>>>>
>>>> 52 processes:  2 running, 49 sleeping, 1 zombie
>>>> CPU:  0.0% user,  0.0% nice,  0.0% system,  0.4% interrupt, 99.6% idle
>>>> Mem: 31M Active, 16K Inact, 3352M Wired, 17M Cache, 48M Free
>>>> ARC: 1838M Total, 110M MFU, 18M MRU, 548K Anon, 1876M Header, 75M Other
>>>> Swap: 4096M Total, 126M Used, 3969M Free, 3% Inuse
>>>>
>>>> Machine is plain dead. Running database or squid or anything causes
>>>> excessive swapping. This is the state when I disabled all payload, with
>>>> everything started swap goes to 500M and machine is burning disks.
>>>>
>>>
>>> I wonder do you use any zfs tuning? Like max arc size? Wonder if setting
>>> that to a reasonable amount would help.
>>
>> Please read carefully my first message. No any tuning (configs
>> posted), and problem is not that ZFS uses big amount of memory. I'm
>> experiencing exactly one problem - Wired mem is significantly larger
>> than ARC.
>> E.g. if my ARC size is 2048M, I'm expecting that Wired will not
>> consume more than ARC+~150M.
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>
> Other pieces of the system used wired memory......
>
> Have you investigated that as well?
And again - this has detailed explanation in the first letter. In short:
1. I've booted the system without any memory hungry services (only
basic like cron, powerd). Wired is 95M, ARC is 25M.
2. Then I started reading ZFS pool (tar cpf /dev/null
/pool/mountpoint). ARC - 2048M, Wired -  ~2800M.
WTF? Who eats more than 700M of kernel memory? Do you really think
that powerd or cron can do this?