ZFS and Wired memory, again

[Anton Sayetsky]

2014-02-28 21:11 GMT+02:00 Adam Vande More <amvandemore at gmail.com>:
> On Fri, Feb 28, 2014 at 12:53 PM, Anton Sayetsky <vsjcfm at gmail.com> wrote:
>>
>> 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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>> >> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
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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?
>
>
> Without question, cron could do it.
>
> --
> Adam
But never does on the same system with ZFS disabled.