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Date:      Tue, 6 Mar 2018 13:36:45 -0600
From:      Larry Rosenman <ler@lerctr.org>
To:        "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>
Cc:        Trond Endrest?l <Trond.Endrestol@fagskolen.gjovik.no>, FreeBSD current <freebsd-current@freebsd.org>
Subject:   Re: Strange ARC/Swap/CPU on yesterday's -CURRENT
Message-ID:  <20180306193645.vv3ogqrhauivf2tr@ler-imac.lerctr.org>
In-Reply-To: <201803061816.w26IGaW5050053@pdx.rh.CN85.dnsmgr.net>
References:  <20180306173455.oacyqlbib4sbafqd@ler-imac.lerctr.org> <201803061816.w26IGaW5050053@pdx.rh.CN85.dnsmgr.net>

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On Tue, Mar 06, 2018 at 10:16:36AM -0800, Rodney W. Grimes wrote:
> > On Tue, Mar 06, 2018 at 08:40:10AM -0800, Rodney W. Grimes wrote:
> > > > On Mon, 5 Mar 2018 14:39-0600, Larry Rosenman wrote:
> > > >=20
> > > > > Upgraded to:
> > > > >=20
> > > > > FreeBSD borg.lerctr.org 12.0-CURRENT FreeBSD 12.0-CURRENT #11 r33=
0385: Sun Mar  4 12:48:52 CST 2018     root@borg.lerctr.org:/usr/obj/usr/sr=
c/amd64.amd64/sys/VT-LER  amd64
> > > > > +1200060 1200060
> > > > >=20
> > > > > Yesterday, and I'm seeing really strange slowness, ARC use, and S=
WAP use and swapping.
> > > > >=20
> > > > > See http://www.lerctr.org/~ler/FreeBSD/Swapuse.png
> > > >=20
> > > > I see these symptoms on stable/11. One of my servers has 32 GiB of=
=20
> > > > RAM. After a reboot all is well. ARC starts to fill up, and I still=
=20
> > > > have more than half of the memory available for user processes.
> > > >=20
> > > > After running the periodic jobs at night, the amount of wired memor=
y=20
> > > > goes sky high. /etc/periodic/weekly/310.locate is a particular nast=
y=20
> > > > one.
> > >=20
> > > I would like to find out if this is the same person I have
> > > reporting this problem from another source, or if this is
> > > a confirmation of a bug I was helping someone else with.
> > >=20
> > > Have you been in contact with Michael Dexter about this
> > > issue, or any other forum/mailing list/etc? =20
> > Just IRC/Slack, with no response.
> > >=20
> > > If not then we have at least 2 reports of this unbound
> > > wired memory growth, if so hopefully someone here can
> > > take you further in the debug than we have been able
> > > to get.
> > What can I provide?  The system is still in this state as the full back=
up is slow.
>=20
> One place to look is to see if this is the recently fixed:
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222288
> g_bio leak.
>=20
> vmstat -z | egrep 'ITEM|g_bio|UMA'
>=20
> would be a good first look
>=20
borg.lerctr.org /home/ler $ vmstat -z | egrep 'ITEM|g_bio|UMA'
ITEM                   SIZE  LIMIT     USED     FREE      REQ FAIL SLEEP
UMA Kegs:               280,      0,     346,       5,     560,   0,   0
UMA Zones:             1928,      0,     363,       1,     577,   0,   0
UMA Slabs:              112,      0,25384098,  977762,102033225,   0,   0
UMA Hash:               256,      0,      59,      16,     105,   0,   0
g_bio:                  384,      0,      33,    1627,542482056,   0,   0
borg.lerctr.org /home/ler $
> > > > Limiting the ARC to, say, 16 GiB, has no effect of the high amount =
of=20
> > > > wired memory. After a few more days, the kernel consumes virtually =
all=20
> > > > memory, forcing processes in and out of the swap device.
> > >=20
> > > Our experience as well.
> > >=20
> > > ...
> > >=20
> > > Thanks,
> > > Rod Grimes                                                 rgrimes@fr=
eebsd.org
> > Larry Rosenman                     http://www.lerctr.org/~ler
>=20
> --=20
> Rod Grimes                                                 rgrimes@freebs=
d.org

--=20
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler@lerctr.org
US Mail: 5708 Sabbia Drive, Round Rock, TX 78665-2106

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