Date: Thu, 6 Feb 2014 09:17:29 +0100 From: Matthias Gamsjager <mgamsjager@gmail.com> To: Anton Sayetsky <vsjcfm@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS and Wired memory, again Message-ID: <CA%2BD9Qhvn=V_1pzTbeJaG%2BJ_0o8oTgzx59HD%2B=%2BjFWqTJiPMTow@mail.gmail.com> In-Reply-To: <CA%2BD9QhuBU12e6tQyiAqPMmg3C-k0k06wrD693J1E_b%2BVUd_wMA@mail.gmail.com> References: <CAFG2KC%2BZSHEVFbpPD9e1QHRdY=Sd6EuAD80vyDLDDQcpgCQNhA@mail.gmail.com> <CAFG2KCJUWtLwR_j2Ykr1J%2BO6PESgs3RdztS_Yx0gNJ_7UmrGJw@mail.gmail.com> <CA%2BD9QhveCGuaeTfjUNaJmmJLXWaTRNFFE6nOxZj9h_0GFuEcwg@mail.gmail.com> <CA%2BD9QhuBU12e6tQyiAqPMmg3C-k0k06wrD693J1E_b%2BVUd_wMA@mail.gmail.com>
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What are your vfs.zfs.zio.use_uma settings? Settings this back to 0 keeps the wired memory inline with the arc. On Wed, Jan 29, 2014 at 10:30 AM, Matthias Gamsjager <mgamsjager@gmail.com>wrote: > Found it. in the Freebsd Current list with subject ARC "pressured out", > how to control/stabilize > looks kinda alike > > > On Wed, Jan 29, 2014 at 10:28 AM, Matthias Gamsjager <mgamsjager@gmail.com > > wrote: > >> I remember reading something similar couple of days ago but can't find >> the thread. >> >> >> On Tue, Jan 28, 2014 at 7:50 PM, Anton Sayetsky <vsjcfm@gmail.com> wrote: >> >>> 2013-11-22 Anton Sayetsky <vsjcfm@gmail.com>: >>> > Hello, >>> > >>> > I'm planning to deploy a ~150 TiB ZFS pool and when playing with ZFS >>> > noticed that amount of wired memory is MUCH bigger than ARC size (in >>> > absence of other hungry memory consumers, of course). I'm afraid that >>> > this strange behavior may become even worse on a machine with big pool >>> > and some hundreds gibibytes of RAM. >>> > >>> > So let me explain what happened. >>> > >>> > Immediately after booting system top says the following: >>> > ===== >>> > Mem: 14M Active, 13M Inact, 117M Wired, 2947M Free >>> > ARC: 24M Total, 5360K MFU, 18M MRU, 16K Anon, 328K Header, 1096K Other >>> > ===== >>> > Ok, wired mem - arc = 92 MiB >>> > >>> > Then I started to read pool (tar cpf /dev/null /). >>> > Memory usage when ARC size is ~1GiB >>> > ===== >>> > Mem: 16M Active, 15M Inact, 1410M Wired, 1649M Free >>> > ARC: 1114M Total, 29M MFU, 972M MRU, 21K Anon, 18M Header, 95M Other >>> > ===== >>> > 1410-1114=296 MiB >>> > >>> > Memory usage when ARC size reaches it's maximum of 2 GiB >>> > ===== >>> > Mem: 16M Active, 16M Inact, 2523M Wired, 536M Free >>> > ARC: 2067M Total, 3255K MFU, 1821M MRU, 35K Anon, 38M Header, 204M >>> Other >>> > ===== >>> > 2523-2067=456 MiB >>> > >>> > Memory usage a few minutes later >>> > ===== >>> > Mem: 10M Active, 27M Inact, 2721M Wired, 333M Free >>> > ARC: 2002M Total, 22M MFU, 1655M MRU, 21K Anon, 36M Header, 289M Other >>> > ===== >>> > 2721-2002=719 MiB >>> > >>> > So why the wired ram on a machine with only minimal amount of services >>> > has grown from 92 to 719 MiB? Sometimes I can even see about a gig! >>> > I'm using 9.2-RELEASE-p1 amd64. Test machine has a T5450 C2D CPU and 4 >>> > G RAM (actual available amount is 3 G). ZFS pool is configured on a >>> > GPT partition of a single 1 TB HDD. >>> > Disabling/enabling prefetch does't helps. Limiting ARC to 1 gig >>> doesn't helps. >>> > When reading a pool, evict skips can increment very fast and sometimes >>> > arc metadata exceeds limit (2x-5x). >>> > >>> > I've attached logs with system configuration, outputs from top, ps, >>> > zfs-stats and vmstat. >>> > conf.log = system configuration, also uploaded to >>> http://pastebin.com/NYBcJPeT >>> > top_ps_zfs-stats_vmstat_afterboot = memory stats immediately after >>> > booting system, http://pastebin.com/mudmEyG5 >>> > top_ps_zfs-stats_vmstat_1g-arc = after ARC grown to 1 gig, >>> > http://pastebin.com/4AC8dn5C >>> > top_ps_zfs-stats_vmstat_fullmem = when ARC reached limit of 2 gigs, >>> > http://pastebin.com/bx7svEP0 >>> > top_ps_zfs-stats_vmstat_fullmem_2 = few minutes later, >>> > http://pastebin.com/qYWFaNeA >>> > >>> > What should I do next? >>> BUMP >>> _______________________________________________ >>> freebsd-fs@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-fs >>> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >>> >> >> >
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