Date: Wed, 7 Mar 2018 14:39:13 +0400 From: Roman Bogorodskiy <novel@FreeBSD.org> To: "Danilo G. Baio" <dbaio@FreeBSD.org> Cc: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>, Trond Endrest?l <Trond.Endrestol@fagskolen.gjovik.no>, FreeBSD current <freebsd-current@freebsd.org>, Kurt Jaeger <lists@opsec.eu> Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT Message-ID: <20180307103911.GA72239@kloomba> In-Reply-To: <20180306221554.uyshbzbboai62rdf@dx240.localdomain> References: <20180306173455.oacyqlbib4sbafqd@ler-imac.lerctr.org> <201803061816.w26IGaW5050053@pdx.rh.CN85.dnsmgr.net> <20180306193645.vv3ogqrhauivf2tr@ler-imac.lerctr.org> <20180306221554.uyshbzbboai62rdf@dx240.localdomain>
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--2fHTh5uZTiUOsy+g Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Danilo G. Baio wrote: > On Tue, Mar 06, 2018 at 01:36:45PM -0600, Larry Rosenman wrote: > > 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= r330385: Sun Mar 4 12:48:52 CST 2018 root@borg.lerctr.org:/usr/obj/us= r/src/amd64.amd64/sys/VT-LER amd64 > > > > > > > +1200060 1200060 > > > > > > >=20 > > > > > > > Yesterday, and I'm seeing really strange slowness, ARC use, a= nd SWAP 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 s= till=20 > > > > > > have more than half of the memory available for user processes. > > > > > >=20 > > > > > > After running the periodic jobs at night, the amount of wired m= emory=20 > > > > > > goes sky high. /etc/periodic/weekly/310.locate is a particular = nasty=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 = backup 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 amo= unt of=20 > > > > > > wired memory. After a few more days, the kernel consumes virtua= lly all=20 > > > > > > memory, forcing processes in and out of the swap device. > > > > >=20 > > > > > Our experience as well. > > > > >=20 > > > > > ... > > > > >=20 > > > > > Thanks, > > > > > Rod Grimes rgrime= s@freebsd.org > > > > Larry Rosenman http://www.lerctr.org/~ler > > >=20 > > > --=20 > > > Rod Grimes rgrimes@fr= eebsd.org > >=20 > > --=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 >=20 >=20 > Hi. >=20 > I noticed this behavior as well and changed vfs.zfs.arc_max for a smaller= size. >=20 > For me it started when I upgraded to 1200058, in this box I'm only using > poudriere for building tests. I've noticed that as well. I have 16G of RAM and two disks, the first one is UFS with the system installation and the second one is ZFS which I use to store media and data files and for poudreire. I don't recall the exact date, but it started fairly recently. System would swap like crazy to a point when I cannot even ssh to it, and can hardly login through tty: it might take 10-15 minutes to see a command typed in the shell. I've updated loader.conf to have the following: vfs.zfs.arc_max=3D"4G" vfs.zfs.prefetch_disable=3D"1" It fixed the problem, but introduced a new one. When I'm building stuff with poudriere with ccache enabled, it takes hours to build even small projects like curl or gnutls. For example, current build: [10i386-default] [2018-03-07_07h44m45s] [parallel_build:] Queued: 3 Built:= 1 Failed: 0 Skipped: 0 Ignored: 0 Tobuild: 2 Time: 06:48:35 [02]: security/gnutls | gnutls-3.5.18 build = (06:47:51) Almost 7 hours already and still going! gstat output looks like this: dT: 1.002s w: 1.000s L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name 0 0 0 0 0.0 0 0 0.0 0.0 da0 0 1 0 0 0.0 1 128 0.7 0.1 ada0 1 106 106 439 64.6 0 0 0.0 98.8 ada1 0 1 0 0 0.0 1 128 0.7 0.1 ada0s1 0 0 0 0 0.0 0 0 0.0 0.0 ada0s1a 0 0 0 0 0.0 0 0 0.0 0.0 ada0s1b 0 1 0 0 0.0 1 128 0.7 0.1 ada0s1d ada0 here is UFS driver, and ada1 is ZFS. > Regards. > --=20 > Danilo G. Baio (dbaio) Roman Bogorodskiy --2fHTh5uZTiUOsy+g Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJan8FPAAoJEMltX/4IwiJqbHgH/jzaMFhsJlL/wVZo+iVfdbxL 4Z8CPlUb8Ng56yw5iR63yE1ny99lC2tcFGsB0D0Q1lbIrhpDmO4oxRFMtV6JlMN9 RA8QFTMzqCZ86DWfkvj65uJBswLDEZm+5COU5R1bRVN/xrKSJukJ2nYAJI6pwpsE 0o1YFCPJdw93kyooDBdDt/vyqmutOBDDumGGYex9EbkNu+3EK6qCSq62Y1ZSYbod tS8wJU3D4a0JtjpvREsUrUabF+lFDn+Qv3fVsoZham8nSJVynh33S+Nr1O4dhsIg wyIOc3HouVZdG6+Y+uD9zvGFNb2tBlisY2G+WUywyRJ1AQB3CfKTiTCUQw5m2p4= =HubY -----END PGP SIGNATURE----- --2fHTh5uZTiUOsy+g--
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