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Date:      Thu, 21 Jul 2011 16:36:49 -0300
From:      Luiz Otavio O Souza <lists.br@gmail.com>
To:        David P Discher <dpd@bitgravity.com>
Cc:        freebsd-fs@freebsd.org, Ivan Voras <ivoras@freebsd.org>
Subject:   Re: ZFS and large directories - caveat report
Message-ID:  <5542D910-0C5C-4B2B-885F-CC92901367F0@gmail.com>
In-Reply-To: <E3F8D6EC-2CCA-49A2-9BFD-982BF01A3531@bitgravity.com>
References:  <j09hk8$svj$1@dough.gmane.org> <13577F3E-DE59-44F4-98F7-9587E26499B8@gmail.com> <CAF-QHFUs7OAAwcFvSymc3YYX3Cdq%2BQUUSP_4OFXCegCbzLkOUA@mail.gmail.com> <E3F8D6EC-2CCA-49A2-9BFD-982BF01A3531@bitgravity.com>
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On Jul 21, 2011, at 3:48 PM, David P Discher wrote:

>=20
> Ivan -
>=20
> What's your uptime ?
> Are you using l2 arc ?
> what is the value of 'sysctl kstat.zfs.misc.arcstats.evict_skip' ?
>  is this increasing quickly ?
>=20

Don't know about Ivan's case, but mine is definitively increasing it =
quickly (and i'm not using l2arc):

sysctl kstat.zfs.misc.arcstats.evict_skip                                =
                                                                         =
                                                        =20
kstat.zfs.misc.arcstats.evict_skip: 129995601

And just a few minutes later (while running find on my 4 million files =
FS):

sysctl kstat.zfs.misc.arcstats.evict_skip
kstat.zfs.misc.arcstats.evict_skip: 130589384

But i guess i need to increase the arc_meta_limit as well:

vfs.zfs.arc_meta_limit: 536870912
vfs.zfs.arc_meta_used: 579461312
kstat.zfs.misc.arcstats.demand_data_hits: 4400985059
kstat.zfs.misc.arcstats.demand_data_misses: 699262
kstat.zfs.misc.arcstats.demand_metadata_hits: 1057208432
kstat.zfs.misc.arcstats.demand_metadata_misses: 32782389
kstat.zfs.misc.arcstats.prefetch_data_hits: 3302738888
kstat.zfs.misc.arcstats.prefetch_data_misses: 225108
kstat.zfs.misc.arcstats.prefetch_metadata_hits: 418744564
kstat.zfs.misc.arcstats.prefetch_metadata_misses: 147815306

kstat.zfs.misc.arcstats.evict_skip: 130781386
kstat.zfs.misc.arcstats.evict_l2_cached: 0
kstat.zfs.misc.arcstats.evict_l2_eligible: 2514187700736
kstat.zfs.misc.arcstats.evict_l2_ineligible: 176966735360


Unfortunately i need to wait a little bit until i can reboot this server =
with the new sysctl values.

Thanks everyone for the hints so far.

Luiz=

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