Date: Thu, 21 Jan 2016 18:55:45 -0500 From: Mason Loring Bliss <mason@blisses.org> To: dweimer <dweimer@dweimer.net> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS performance help sought Message-ID: <20160121235545.GK4538@blisses.org> In-Reply-To: <20160121232810.GJ4538@blisses.org> References: <20160121205139.GG4538@blisses.org> <ea3f05f9a8c20bd62a1c391b432dafe2@dweimer.net> <20160121232810.GJ4538@blisses.org>
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On Thu, Jan 21, 2016 at 06:28:10PM -0500, Mason Loring Bliss wrote: > All that said, I wasn't setting write_limit_override, so I'm trying that, and > I'm cutting the txg.timeout back a couple seconds more. Well, that didn't help. System's still really choppy. last pid: 1707; load averages: 9.20, 4.75, 2.14 up 0+00:09:35 18:53:03 55 processes: 1 running, 54 sleeping CPU: 2.1% user, 0.0% nice, 62.6% system, 0.5% interrupt, 34.8% idle Mem: 323M Active, 331M Inact, 4589M Wired, 8928K Cache, 2677M Free ARC: 4096M Total, 916M MFU, 2303M MRU, 845M Anon, 17M Header, 15M Other Swap: 8192M Total, 8192M Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 1501 root 1 33 0 42248K 3616K dmu_tx 1 0:10 5.76% zfs 1500 root 1 24 0 42248K 3768K pipewr 0 0:08 5.18% zfs Here's what I set: vfs.zfs.arc_max="4096M" vfs.zfs.arc_min="1024M" vfs.zfs.txg.timeout="3" vfs.zfs.write_limit_override="512M" I'm not seeing any obvious way to verify the write_limit_override setting - it appears not to show up in sysctl output. I'll wait for the current big transfer to finish and then I'll try it with prefetch disabled too. -- Mason Loring Bliss mason@blisses.org Ewige Blumenkraft! awake ? sleep : random() & 2 ? dream : sleep; -- Hamlet, Act III, Scene I
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